I like ones that are clean and good lighting (the one on the range is so dark can't see easily but it's a nice one) but main thing is how they care for their animals are they timid when they handle them how's the health of everything, I always like to see their live feeders are even kept in a nice clean area. Far as selection goes that i always go buy how many different species the have of everything not just tons of balls or Leo geckos. I'm not too picky just give me nice animals that aren't sick and nice staff! Lol