I've been a U2 fan since 1996, after intensely hating them for several years. Yes, I did not like U2, but then I bought Achtung Baby and converted.
My favorite U2 songs are One and With or Without You.
One more note before I go. It was once my goal in life to see U2 perform live... i reached that goal May 3, 2001 in Cleveland, OH. Yay!