SEO takes months and Google decides when it works. Ads take a day and you decide — you buy the top of the page for searches that already mean money: «med spa near me», «same day appointment», «open now». The catch is how easily a budget burns on clicks that were never going to book.
I will not promise you a number of new clients — nobody honest can, and anyone who does is quoting someone else's business. What I can promise is that you will see what each call cost and where every dollar went.
Google will spend whatever you allow. A campaign without a ceiling is a leak, not a strategy.
At the start the negatives matter more. Most wasted money is clicks from people who were never going to be customers.
Early numbers are noisy. After that the searches that bring real bookings keep the budget and the rest gets switched off.
It depends on how much there is to set up, so I would rather look first than put a number on a page. Tell me how clients reach you today and I will tell you what it takes — on the call, not after three meetings.