Start with the buying decision
A search campaign can reach someone already looking for a service. A social campaign can introduce an offer while someone is doing something else. For a local shop, the first question is whether enough people nearby already search for the work you want to sell. Review service demand, competition, job value and capacity together.
When search is a useful first test
Google Search is worth assessing when the service has clear buying-intent searches and a landing page can answer them. Separate coating from maintenance detailing, or emergency repairs from planned installation. Review actual search terms and exclude irrelevant jobs, training and product searches. A click is useful only if the resulting conversation fits your business.
When social has something to work with
Meta campaigns benefit from a specific offer and convincing creative. A detailing shop may have useful preparation videos, finished vehicles and package explanations. Those assets give you different messages to test. Plan who responds to enquiries and how you will distinguish a real quote request from casual interest. Retargeting also depends on the audience available and the applicable privacy settings.
Choose the test before choosing the winner
Agree a budget, a definition of a useful enquiry and how bookings are recorded. Review cost per qualified enquiry and booked job alongside response time and capacity. Avoid splitting a small budget across several platforms before any one test has enough evidence. Expand when the results explain why the next channel belongs in the plan.