Of the three I've visited, this seems to be the most active and most interesting, for better or worse.
I really don't care for the U2.com forums. There seems to be less discussion of stuff, just questions or general comments as a thread, and you sometimes see 8 threads about the same thing. (I really don't go there that often, so that's just my general impression of the place.) Also, I find the format hard to read, especially when people start quoting other posts.
There seems to be better general discussion of things on the @U2 forums, with less of the insanity we see around here. There are disagreements, but again, with less of the insanity that always seems to pop up in so many threads. There seems to be less nit-picking and piling on people you disagree with, so I totally understand why some people come here from other forums and are all 'holy shit, everything I've heard about this place is true. You guys are fucking insane.'
I don't know why this place is the way it is. Obviously, it has a lot of good things going for it, but the incessant nitpicky arguments is not one of them.
People may have other comments about the other forums - I haven't spent a ton of time on either, so maybe others' experiences are different. I rather like the @U2 forums, just don't spend a lot of time there. Can't really say why, either. And I haven't explored their "non-U2" parts of the forums, just the general U2 sections.
I guess this place has just sucked me in completely, for better or worse (almost always 'for better' - when I start feeling like it's 'for worse,' I know it's time to take a break.
)
I came for the U2, and despite all the bullshit, stayed for the lulz and for the people.
Well. And the U2.