Here is my 2 cents.

Customer Service is number one even over cheaper/less esxpensive prices.

I like to walk into a store and be greeted. Ive walked into certain stores where the associates look at you and not say a word or dont even look your way at all.

I like a store thats willing to help. For example, if they dont have a certain fish or product in stock or not even usually have it at all, but they go out of their way to order it. Also helping out in a emegency situation- Tank leak, sick fish etc.....

A clean store with nice displays help, but not so nice that it raises the cost on products. Im going to a store not a city aquarium.