Being new to the hobby I have to say if I had a LFS I would be in serious trouble, don't know how you guys do it..
To be 100% honest we have a small one in my hometown but he has algae growing in his tanks and trash piled on the counter.. totally serious. Went in one time to get a Betta for my sons tank and out of the ten or so Betta cups 4 were floating dead in their yellow poop filled water.. just won't go back.. I do have to say the guy is nice and very willing to help, seems to know what needs to be done, just doesn't do it for his own store..
We do have a PetCo about a hour away but I have been told repeatedly not to buy fish there.. no personal bad experience there just going off advise from locals with more experience than me..
Amarillo Tx has Fish Pros.. awesome mom and pop style store. Clean great selection and knowledgeable staff that is more than willing to spend all the time it takes with you to answer any and all questions. Owner even gave me his cell number so I can text him if I have problems. Hard to beat that.. except it's 165 miles one way...
My sister lives in Norman Ok.. 260 miles away.... Wet Pets by Steve is AWESOME. Clean, large friendly knowledgeable staff, always someone that know what they are talking about there to help..
I guess the biggest thing I look for is
Cleanliness
Friendly staff
Willing to help
Selection
Price is last
Also would add (if you are looking into getting into the business) use top down selling.. more than once I have been into LFS, explained where I am at with my tank and what I think I need. These particular shops just try and sell me the cheapest point of sale that is on the shelf.. Now being a avid researcher I usually know if there is more than one option and like to hear their opinion on the merits vs price of each. I don't wanna just be sold whatever they happen to stock on the shelf because that's what most people get.. spend the time and give me all the options then let me (the customer) decide.. I will walk out empty handed 99 times out of 100 if that's how they operate....