I chose mine based on recommendations from neighbors and trying out the vet after I wasn't happy with our first one. I like our vet's demeanor, office staff, and the fact that I can call with questions any time.
Some people here recommend AAHA-accredited vets. In my area, the one that is accredited is not that great and not to my liking.
Here is the website:
https://www.aahanet.org/
Banfield has a lot of mixed reviews that tend toward the negative. I've heard many complaints that they over-vaccinate, over-treat, and are pricey. I don't have personal experience with them.