As an aside on the Ultraviolet debate, as you know, on the album, Edge layers a few guitar parts over each other. The main difference between the live Zoo TV version and the 360 version is which parts he chooses to play and when.
On Zoo TV, he developed a new riff for the bridge, but otherwise, everything else has been a guitar part from the album. On Zoo TV he sticks mostly to the prominent rhythm guitar for the entire song, whereas on 360 he switches (via pedal) to the background layer halfway through the song.
To me, both sound very cool and I love both versions. And to the OP's point, it mixes the sound up just enough to keep us entertained and surprised. It's not like playing Pride on the same guitar tone at the same speed over and over.
And for what it's worth, I think Zoo TV worked so fabulously for a lot of reasons, but perhaps none bigger than the fact that on the album, the guitar parts were intricate and woven into a complex sonic landscape, but live, Edge was able to pull forward a main guitar line in the mix and it carried amazing punch.