I think I'm leaning towards the 3 month league. I've grown up playing all kinds of sports, therefore, I am highly used to and accustomed to actual "season" type leagues, which run over a couple month span, this is also the best way to prove who really is the best if that's the objective. Although I'd prefer it to be a longer season, I wouldn't be against it just being a weekend tournie if it needed to be.
I also agree with Greg, in the future if you can set up a field in every major paintball market that wants to compete then you could eliminate travel hassels and have those leagues compete for a top seed. When that's over the champions from each region will compete in NJ, where the homefield is, and then there could be 1 champion team named.