Well, it's hard to say really, not being you and all, but my basic advice is to do the one that will keep you interested and keep you training.
Me personally, I hate taking falls and rolling ... though others love it. I find the Japanese systems too formal, but it really helps others focus.
I trained at a great boxing gym in my neighborhood a while back now, totally old school - wrong side of the tracks, literally! Damp, smelly and worn, but full of great trainers, and a motley mix of cops, semi pros and gangstas, all doing their thing on the heavy bags or in the ring. The way it worked there was that you got a trainer as part of the monthly deal who would run you through conditioning exercises, technique, pad work, heavy bag etc.
If your place is like this, be warned, generally you get handed a jump rope and it's straight into 3 minute rounds to warm up, no real conversation about your fitness level or medical problems, it's left to you to pace yourself .... you won't be walking the next day if you are not careful!... like I said, old school.
Over time you were expected to get a feel for a personal workout and find training partners, but the trainers were there to correct form, do pad work etc. Eventually sparring for those that were interested.
I had a blast training there.
Most boxing gyms have wraps and safety gear for sale, and there are gloves to borrow when you start ... though they generally smell so bad it works as a great incentive to get your own!
Let us know how you get on

_________________
"It will be difficult at first, but then everything is difficult at first". Miyamoto Musashi