Personally, I haven't seen that many people cosplay the casual one, maybe I just don't look hard enough. And while I have seen TONS of people do the traditonal one it's always so nice to see one that's well done.
I've been thinking of cosplaying Hokuto too, hopefully the traditional costume if I have time...but I digress.
I guess it would kinda depend on which costumes your friends are doing. Are they doing traditional type stuff or the casual ones? And either way, not to sound like a broken record, it all depends on which one is your favorite.
The casual one is easier, but not as recognizable.
The traditional one is more recognizable, but a lot of people cosplay it.
Since you've got the time though, I'd do the traditional one, only cause that's my favorite. ^_^
That's just my opinion. Good luck with deciding. ^^
Next Con: Otakon
Crane!Yuuko [xxxHolic] / Butterfly!Yuuko [xxxHolic] / San [Princess Mononoke]