Are you doing this just for fat loss/cardio and to get the heart rate up or are you trying to become better at self defence? I never came remotely close to what Bagua did/does and never will. I have a BOB, a heavy bag, and a group to spar with I trust won't lose their cool and we have to show up at work with a broken jaw or black eyes.
Either will do - I think it was
@gondar1 that said find something you like. I would definitely agree.
The only cardio I really like is with my better half, walking & training my dogs, and heavy bag, focus pad, and work with BOB. They don't hit back. If you are going to spar - make sure you know the other people well if you have a job you can't show up at with black eyes or a broken nose. Sparring is a blast but inevitably if you don't know the person well, it can get dangerous especially if someone has a bad temper. The control on this is what
@Bagua said - if someone stands out and can slap the shit out of everyone. If your a prick and hit to hurt your partner, your present it to spar with him next and he puts a beating on you.
Off topic but did you watch the movie made about Dustin Poirier and he was one of the top guys in the gym (before he was in the UFC) - top level guys who may go somewhere. One of the guys got lazy and stopped showing up, his first time back his reward was to spar with Dustin and the coach told Dustin to put a beating on him. These aren't your average guys who go to work everyday in a suit or train for fun - they were competing and trying to get to the top so it is somewhat different but gets the point across.
I do it because I enjoy it - I can't stand sitting on or standing on machines for 30 minutes.