it's the same thing with one, that also has an expanded verse at the end, same thing as wowy. Allmost all U2 songs are different played live, than appeared on the album.
They all have a point. Walk On live also has dozens of "Hallelujah"'s at the end (although, the version on U2-7 sort of has something similar so who knows.
I think they just change the songs around a bit so they don't get too bored with them. I mean, how many times can you play the same songs over and over without getting tired of them. Escpecially songs that you've been playing for years. I think that's why they changed Streets for Popmart.
The ZOOTV solo in Bullet always blows me away. That's my favorite version. I also love the ZOOTV version of Running To Stand Still. But, I like the reworked version of The Fly from the last tour.