The short answer
If people search for what you sell, start with search ads, because intent is already there. If they do not know your service exists, search has nothing to capture and social is where you create the demand.
The test is simple: look at whether there is meaningful search volume for what you actually do, in the words customers would use rather than the words you use.
The fundamental difference
| Search ads | Social ads | |
|---|---|---|
| Audience state | Actively looking | Not looking |
| Targeting basis | What they typed | Who they are and what they do |
| Intent | High | Low to none |
| Cost per click | Usually higher | Usually lower |
| Creative dependence | Lower | Very high |
| Suits | Known needs | Unknown or new services |
The creative row matters commercially. Social performance swings enormously on creative, which means an ongoing production requirement that search does not have.
Where search wins
- People search for your service by name or by problem
- The need is urgent or time-bound
- You can answer a specific query better than competitors
- Your service is a considered purchase people research
For most established professional services, this is the starting point. Someone searching for a supplier is worth considerably more than someone who was scrolling.
Where social wins
Services people do not know exist, or do not know they need. Visual work where the result can be shown. Audiences defined by role or sector rather than by a search term.
It also works for staying present with people who already know you, which search cannot do because it waits for them to come looking.
The honest constraint
Running both properly is more work than most small teams have capacity for, and running both badly produces worse results than running one well.
Pick the one that matches your demand situation, get the measurement right, and only add the second once the first is working and measured.