I don't really know of any other game stores that can compare with GameStop...they have pretty much everything I could ever want. Even when I don't know that I want it.
This particular location has really friendly, really helpful team members who are always eager and wiling to talk about any game in the store. Many of them have personal experience with most of the games, systems, and extra products, so while they provide their opinion, they are also pretty good at remaining objective when giving an overview.
Being a ProMember saves me sooo much money (I'm almost embarrassed at how often I frequent this place. Almost), and allows me to trade in games for quite a bit more than if I weren't a member, while also allowing me to collect points I can use in their online store to purchase special items not in-store. I love that they have such a huge selection of used games as well as all of the newest releases. They are very up-front about what new titles are being released when, and take a simple $5 pre-order to hold onto a copy of anything that might be coming out (which then gets put towards the purchase of that game, so you're not losing money holding it).
Overall, this is a store I don't ever feel bad about spending too much time in when I'm looking for something to spend more time on.