I think it's hilarious that more than one person actually took the time to respond but were SO torn that they actually couldn't pick one or the other. Are you kidding? It'll be ok, you won't hurt the feelings of the song you don't choose.
Tough one
I'd have to go with WUDM though. I agree with 2233, more relevant lyrics. Both have great melodies.
In case you didn't know, Bono mentioned in the Rolling Stone Interview that Gloria was a "Byzantine attempt to sing your way into the kingdom of heaven." ... whatever that means