Well, either way, Brawl's still awesome

I'd have to say that in the end, I'd prefer it over MVC3 overall, because of the fact that...
1. The only possible infinites in Brawl are pretty hard to pull off, whereas in MVC3, it's only a matter of a few seconds into the match that you can do one (personal experience, I've only done a laser lock with Falco once in my whole life, and that was online against Juan).
2. I think that when it comes to balancing, in the end, Brawl ends up placing on top of MVC3. Sure, there's the whole "Metaknight, blahblahblah, Snake's too strong blahblahblah," but I mean, in the end, the metagame for Brawl has changed ENTIRELY. You get characters like Sonic who are placing top in tournaments now, and even people like Ness or Diddy are threats. Whereas in MVC3.....you're only facing Sentinels, Dantes, and Magnetos lol.
That's just my opinion, because I just got back into Brawl after being away from it for soooo long. I think I'll probably play some online Brawl matches too if anything. If anyone's up for it, just get on Skype!