My top 3 are:
Reyes boxing under Jerry Reyes
Legends Boxing under Francisco Arreola
Trigga City Boxing under Omar
I've trained at all of them and all are great, but with slight differences:
Reyes is a hard nose, tough gym. Heavy sparring, rough gym overall, great trainer though. You can get lost here, but Jerry does make an effort to work with everyone. There's a lot of talent though, so you gotta focus and work. You will bleed at this gym.
Trigga City is on the other end. Beautiful facility, good trainer, good sparring. You can go at your own pace here and still get attention. One of the nicest boxing gyms I've ever been too, constant updates and additions and has an amateur program.
Legends sits somewhere in between. The trainer is good and was a champion southpaw that lost to JMM. You can do your own thing, but you will blend in eventually. To be noticed you have to work. Pumps out decent amateurs.
There's also Hurricane boxing gym off I-4. They pump out a lot of amateurs, but I don't know much else.
However, if you are serious about this and willing to drive up 75 north for about 40 min, you can train at my gym for free. All it requires is that you are registered with USA Boxing. You can PM me if you want more info about my gym.