Both are great gyms with talented teams and coaches I'm sure. It really is about what works for you. Have you taken classes at either? If not, try to do so, or sit in on a practice at both. That way you can decide which one will fit you better. Some gyms are great for one type of person and not so great for other types, so you just need to figure out which one is right for you. Don't make a decision based on what your friends say or which gym is more famous, try both (before tryouts) so you can get a feel, because otherwise there's really no way to decide other than reputation. (Not that reputation isn't important, but both have good reputations so you can't really decide by that.)
Also take other things like cost and carpooling in to consideration, but ultimately you should go wherever feels right for you.