I prefer actual bootleg recordings of concerts over commercial releases in a lot of cases. The commercial releases edit out a lot of banter, false starts, etc. They also tend to re-engineer into a studio session. When you get these raw live performances, and leave in all the flaws and "extras", it helps, I think, to bring to the Live experience. That's what I like.
As for U2
I honestly thought that the 360 Tour was mediocre. Not really one of my favorites. Mind you, I think seeing that stage would have been larger than life, but that's it. I think my favorite Tour of theirs would still have to be the original ZooTV Tour, followed by the Elevation Tour, then the Joshua Tree Tour, and the Unforgettable Fire Tour. I think that 360 really comes out just after that, maybe. Hard to tell. I will say that their latest tour, the Innocence one, from what I've seen and heard so far, comes in dead last.