With the growing popularity of MMA, Kickboxing and Jiu-Jitsu gyms worldwide, one has trouble deciding on where to train. There are pros and cons to big and small MMA gyms.
Big gyms: are very tempting to try out. "Everyone goes there" Is the feeling you get from a larger more established location. They might have a high-level pro fight team. Who wouldn't want to rub elbows with famous fighters seen on TV. Since they're already established, you can feel better about learning from a tried and tested source. Some people are just coming in for the workout and feel better knowing the place is well run and will probably be around for a while. They can have a better assortment of amenities and equipment. And of course bigger gyms have a wider range sparring partners.
Small Gyms: Luckily for the little guys, America has an affinity for the underdog. Aside from the romantic notion of 300 Spartans squaring up against the massive Persian Army, students can feel better getting a more personalized approach. In classes, the instructor has more time to spend with individual students. Smaller gyms have a higher likely hood of having the owner or an established fighter teaching beginner classes. Unlike the larger gyms, there is a vested interest from an aspiring professional coach or trainer to see his/her students excel, showcasing their progress to a tightly knit martial arts community.