Facebook Ads vs. Google Ads: Which Platform Should You Invest In?
The question gets asked in every pitch meeting, strategy session, and first-time advertiser conversation: should we run Facebook Ads or Google Ads?
It's the wrong question. But since almost everyone asks it, let's answer it properly — with the frameworks, benchmarks, and real-world scenarios that help you make an actual decision.
The Fundamental Difference: Intent vs. Interruption
Understanding why Facebook and Google are different requires understanding the moment of contact:
Google Ads: Demand capture Someone types "emergency plumber London" or "best project management software" into Google. They have active intent. They're looking for a solution right now. Your ad intercepts that intent at the moment of maximum purchase likelihood.
Facebook Ads: Demand creation Someone is scrolling through their feed, watching a video about their dog, when your ad appears. They didn't ask for it. They weren't thinking about your product. Your job is to interrupt their attention positively and create desire for something they weren't actively seeking.
This one distinction explains most of the differences in how these platforms work, what they cost, and when each is the right choice.
Cost Comparison: What You Actually Pay
Neither platform is categorically "cheaper." Costs depend on industry, audience, and how well the campaigns are built. But directionally:
Google Ads cost benchmarks (average CPC):
| Industry | Google Ads Avg CPC |
|---|---|
| Legal | $8 – $30 |
| Insurance | $6 – $20 |
| Finance | $5 – $18 |
| Software / SaaS | $3 – $12 |
| Healthcare | $2 – $8 |
| Ecommerce (general) | $0.50 – $2.50 |
| Education | $1 – $5 |
| Real Estate | $2 – $10 |
Facebook/Instagram Ads cost benchmarks (average CPM):
| Audience type | Facebook/Instagram CPM |
|---|---|
| Cold audience, broad targeting | $6 – $15 |
| Warm audience (website visitors) | $15 – $35 |
| Lookalike audiences | $8 – $20 |
| Narrow interest targeting | $12 – $25 |
Comparing CPCs to CPMs is apples to oranges. The relevant metric is cost per conversion — and that's where the real comparison happens.
Typical CPAs across platforms (varies widely by industry and execution):
| Business type | Google Ads CPA | Facebook Ads CPA |
|---|---|---|
| Lead gen (B2C) | $20 – $80 | $10 – $50 |
| Lead gen (B2B) | $50 – $300 | $40 – $200 |
| Ecommerce purchase | $15 – $60 | $12 – $55 |
| App install | $2 – $10 | $1 – $8 |
The ranges overlap significantly. Which platform delivers lower CPA for your business depends on your specific product, audience, and execution quality — not platform.
When Google Ads Wins
Google Ads has structural advantages in specific scenarios:
1. High purchase intent, existing demand If people are actively searching for what you sell, capturing that intent is more efficient than creating demand from scratch. A plumber, a lawyer, a SaaS product in an established category — Google is the right first channel.
2. B2B with specific job titles or industries Google's keyword targeting for B2B decision-maker searches ("ERP software for manufacturing," "HIPAA compliant HR software") often reaches buyers at a more purchase-ready moment than Facebook's interest-based targeting.
3. Local services with geographic demand "Dentist near me," "Italian restaurant Barcelona," "accountant for small business Glasgow" — these searches have clear local intent that Google captures extremely well.
4. High-consideration purchases with long research cycles Someone buying a $50,000 piece of industrial equipment or a $200/month software subscription does research. They Google it. Being present at every research query across the buying journey is more valuable than interrupting their social feed.
5. Products or services people don't know exist Wait — if they don't know it exists, they won't search for it. Correct. Which is why new product categories start on social media and move to search as the category matures.
When Facebook Ads Win
Facebook/Instagram has structural advantages in different scenarios:
1. Products with strong visual appeal Fashion, beauty, food, home decor, fitness — categories where seeing the product creates desire. You can't show a jacket "searching for jackets." You can show it scrolling through Instagram.
2. Impulse purchases under $100 Facebook excels at driving purchases for products with low decision friction. The combination of visual creative, social proof, and frictionless checkout (Facebook/Instagram Shopping) compresses the buying cycle.
3. Building brand awareness and consideration Before people search for your brand, they need to know it exists. Facebook is the demand creation engine that builds the audience that later converts on Google.
4. Audience-based targeting you can't replicate in search Targeting people who just had a baby, recently got engaged, are interested in a specific niche hobby, work at companies of a certain size — Facebook's behavioral and demographic data creates targeting options Google search can't match.
5. Retargeting across the consideration window Facebook remarketing to your website visitors, email subscribers, and past customers is highly effective. People who know your brand convert at 5–10× the rate of cold traffic.
The Full-Funnel Reality
Here's the truth that the "Facebook vs. Google" framing obscures: most successful advertisers use both.
The typical customer journey for a considered purchase:
- Sees Facebook/Instagram ad → brand awareness
- Searches brand name on Google → brand search campaign captures
- Visits website, doesn't convert → Facebook remarketing brings them back
- Returns to website directly, converts
- Gets Facebook retargeting for upsell/cross-sell
In last-click attribution, Google gets the credit for the conversion (step 4). Facebook appears to underperform. Remove Facebook from the mix, and brand search volume drops. Conversions drop. The "expensive" Facebook awareness campaign was doing real work that last-click attribution made invisible.
This is why multi-touch attribution and incrementality testing are essential for any advertiser spending seriously on both platforms.
How to Decide Where to Start
If you have to choose one platform to start with, use this decision framework:
Start with Google Ads if:
- Your product/service has clear, specific search queries people use to find it
- You're a local business or service
- Your sales cycle is primarily research-driven
- You have budget for $2,000+/month (or CPCs in your industry allow it)
- You need leads or sales immediately, not brand building
Start with Facebook Ads if:
- Your product has strong visual appeal and impulse-purchase potential
- Your target audience is defined by interests, behaviors, or life events rather than search intent
- You're launching a new product category with no existing search demand
- Your budget is limited and CPCs in your industry would make Google unviable
- You want to build a remarketing audience before scaling Google spend
Start with both if:
- Budget allows ($5,000+/month across both)
- You're in a category where both demand capture and demand creation are valuable
- You have the team or agency capacity to execute both well
Budget Split Between Platforms
For advertisers using both, a general starting point:
Primarily Google (60-70% Google / 30-40% Facebook):
- High-intent B2B products
- Local services with strong search demand
- Products in categories with established Google search behavior
Primarily Facebook (60-70% Facebook / 30-40% Google):
- Visual consumer products
- New brands building awareness
- Products with low search volume but identifiable audiences
Even split (50/50):
- Ecommerce brands with both strong visual creative and established search volume
- Subscription services building both new customer acquisition and brand awareness
These are starting points. Actual allocation should follow performance data — not formulas.
Attribution: The Platform That "Wins" Depends on How You Measure
Every comparison of Facebook vs. Google is distorted by attribution. Both platforms measure their own impact optimistically:
- Facebook counts a conversion if someone saw your ad in the last 28 days (view-through attribution)
- Google counts a conversion if someone clicked your ad and converted within 90 days
The same conversion can appear in both platforms' reports. The combined "reported" conversions from both platforms often exceeds actual total conversions by 40–80%.
Better measurement approaches:
- GA4 with data-driven attribution
- Incrementality tests (spending blackouts or geographic holdouts)
- UTM-consistent tracking across all campaigns
- Northstar metric: actual revenue in your CRM, not platform-reported conversions
The Honest Answer
Neither platform is inherently better. Google Ads is better for demand capture. Facebook Ads is better for demand creation. Most businesses need both at scale.
The businesses that win long-term aren't choosing between platforms — they're building a coordinated strategy where Google captures what Facebook builds.
Where to start depends on where your audience is in their buying journey and what your product looks like. Where to invest long-term depends on what your data says.
Talk to our team about building a multi-channel paid strategy →