The question I get asked more than any other right now: "Should I be running Performance Max or Search campaigns?" Usually the person asking has already tried one, been burned, and is thinking about switching to the other.
Wrong framing.
Performance Max vs Search campaigns isn't an either/or decision. They do different jobs. The trick is knowing which job you actually need done in a given account, and how they behave when they run alongside each other.
Here's how I actually think about it in accounts, plus the situations where one clearly wins.
What Each Campaign Type Is Actually Good At
Search campaigns are intent-driven. Someone types a query, you decide which queries you want to show for, you write ads that speak to those queries, and you pay when someone clicks. You control keywords, negatives, match types, ad copy, and where the money goes. Everything is visible in a report.
Performance Max is the opposite of visibility. You feed Google assets, a budget, a conversion goal, some audience signals, and Google decides where to show your ads across Search, Shopping, YouTube, Display, Discover, Gmail and Maps. You get aggregate performance data and a black-box asset group breakdown. You do not control channel mix, individual placements, or (mostly) the queries it shows for.
That difference shapes every "when to use which" question below.
When Search Campaigns Win
Search is the right call in more situations than most people think.
Lead gen with a tight ideal customer. If you sell $50k B2B services in one industry, you don't need reach. You need to show up when the right five people search this month. Search lets you target high-intent phrases, exclude irrelevant traffic, and control which queries eat budget. PMax doesn't give you that precision.
Small budgets. Under $3,000-$4,000 a month, PMax struggles to gather enough conversion data to exit the learning phase efficiently. You end up paying for reach across channels that don't convert because the algorithm hasn't seen enough signal. A Search campaign on your highest-intent keywords will almost always beat a scattergun PMax at that budget level.
Brand protection. Bidding on your own brand terms is best done in a Search campaign where you control the ads, the extensions, and the landing page. Letting PMax handle brand is one of the fastest ways to inflate your reported CPL, and I've covered why that happens in detail.
When you already know what converts. If your keyword list has meaningful conversion volume, you already know what wins. Adding PMax on top usually cannibalises it before it discovers anything genuinely new.
I audited a legal services client last month who'd switched their whole account from Search to PMax on Google's recommendation. Six weeks in, cost per qualified lead had gone from $180 to $340. The PMax was pulling in "family law" queries that had nothing to do with their commercial litigation practice. We moved back to Search-only, tightened the keyword list, and CPQL was back at $195 within a month. Some accounts just don't fit PMax.
When Performance Max Wins
PMax genuinely earns its keep in a few specific scenarios.
Ecommerce with a Merchant Center feed. This is where PMax was originally designed to shine, and it still does. A well-structured product feed with strong margins and enough data volume will usually outperform Standard Shopping. You get Shopping, Display, YouTube and Search working from the same asset set.
Incremental audience discovery on top of solid Search. If your Search campaigns are already efficient and you've hit a ceiling on impression share for your core keywords, PMax can add reach across audiences you haven't touched. The key word is incremental. If PMax is just eating traffic Search was already getting, you haven't grown, you've just moved money around.
Larger accounts with rich conversion data. PMax's algorithm gets meaningfully better with more data. Accounts pushing 100+ conversions a month across a variety of asset groups tend to see it perform. Under that, results are inconsistent.
When you need creative variety Search can't provide. PMax will happily serve YouTube shorts, Display banners, Discover cards, and Gmail promos from the same asset group. If your business benefits from that kind of visual reach and Search doesn't cover it, PMax fills the gap.
An ecom client I work with runs both. Search on brand and category terms handles the intent-heavy traffic. PMax with brand exclusions handles the top-of-funnel visual reach and the long tail of product queries. Neither campaign works as well on its own as they do together. But that setup only holds up because the account has volume, a good feed, and clean conversion tracking.
Where the Performance Max vs Search Campaigns Question Gets Tricky
The trouble starts when both campaigns compete for the same query and you can't tell what's happening.
PMax will show for any query it decides is relevant unless you actively stop it. If your Search campaign has "commercial cleaning Sydney" as a phrase match keyword and your PMax has an asset group for the same service, both are eligible for the same auction. Google's supposed to route to the highest ad rank, but in practice PMax often wins queries you'd rather your Search campaign handle, because you have less control over the messaging.
That's before you even get to brand cannibalisation. Every audit I do with PMax running finds branded queries being served by PMax at 3-5x the CPC they'd cost through a Search brand campaign. Reported PMax CPL looks great. Blended account CPL is worse than it should be.
What to do about it:
- Add brand exclusions to every PMax campaign. This isn't optional. It's the single most impactful lever you have.
- Use account-level negatives to keep PMax off queries you want Search to own (job searches, competitor names, informational queries).
- Watch the search terms insights on PMax weekly. Google's expanded reporting is limited, but you can still spot patterns. The full walkthrough on reading this data properly is in How to Read Your Google Ads Search Term Report.
- If PMax and Search are both eligible and your Search ads are stronger, tighten PMax audience signals or lower the PMax bid target so Search takes priority on those queries.
How to Actually Run Them Together
If your account is right for both, the setup that works most often looks like this:
- Brand Search campaign. Exact and phrase match on your brand terms. Ads written to reinforce your positioning. High Quality Score, cheap clicks, no PMax involvement.
- Non-brand Search campaign. Your best-converting commercial keywords. Tight match types, aggressive negatives, RSAs refreshed quarterly.
- Performance Max with brand exclusions. Assets for top-of-funnel discovery and long-tail reach. Audience signals pointed at your best converters (customer lists, high-value segments), not just "people interested in [category]".
Budgets split by intent, not by campaign type. Search gets the high-intent share because it converts more efficiently. PMax gets the discovery share because it's better at finding new audiences. Neither campaign is asked to do the other's job.
Small note: this setup falls over the moment your conversion tracking breaks. Both Search and PMax lean heavily on Smart Bidding, which lives or dies on conversion data quality. If you haven't audited your tracking this year, start there before you touch either campaign type.
My Take
Most accounts I audit are running PMax when they should be running Search, or running both without brand exclusions. The Performance Max vs Search campaigns question isn't philosophical. It's a fit test. If you have volume, a feed, clean tracking and you've hit a ceiling on Search, PMax earns its place. If you have a small budget, a niche audience, or leaky tracking, PMax is going to bury you.
Google's default recommendation is always "add PMax". They're not wrong to say that on average, across their whole advertiser base. They're wrong to say it about your account without looking at your account.
Key Takeaways
- Performance Max vs Search campaigns isn't an either/or. They do different jobs and often work best together.
- Use Search when you need intent precision, a small budget has to work hard, or you're protecting brand.
- Use Performance Max when you have an ecom feed, larger budgets, rich conversion data, or you've hit a Search ceiling.
- Always run PMax with brand exclusions. Every time. No exceptions.
- Don't add PMax to an account with broken conversion tracking. It'll just amplify the damage.
- If Google's rep tells you to switch entirely from Search to PMax, get a second opinion before you flip the switch.
If you're not sure which one is actually right for your account, or you're running both and the numbers don't add up, that's the sort of thing worth a proper look. Get in touch and I'll tell you which parts are working and which parts aren't.