I think caring about the animals is important, but knowledge is more important.
No one wants a under qualified vet - especially in a field as specific as reptiles, where efficiency and superiority of the field means a higher customer retention rate
Being "over qualified" would probably be the best reason to choose one vet over another, plus it would let you charge more to your customers ( just saying ).
For example, I am taking my chams this weekend to see a Vet in Beverly Hills, his appointment is going to run me more than $100 for the two chams, for the "visit" alone, no meds or fecals included.
I couuulllddd go to a vet thats only 5 mins away from my house, where I could get both chams in for about $60.
I chose the more expensive vet because after a little research I learned that the Dr. Has helped many chameleons (so he has background experience), he has kept chameleons before (more experience) and he is a reptile specialist. Compared to the other vet whose mainly seeing cats and dogs, and would most likely treat my chameleon as an Iguana. The choice became obvious.
Besides strong knowledge in the field (especially one as complex and diverse as reptiles/amphibians) I would have to say that I would rate care received, follow-up care (I.E calling to see if the medication is working for the animal - see if its doing better - e.t.c e.t.c) personality (please don't yell or say "you should know better!" to a patient.... some people do it, and it just makes them sad.) as part of the overall package that would keep me coming back to you as my vet.

Good luck in Vet school!