Here's my list
In no particular order, these are my 10 favorites..
1) Mercy (I know it wasn't released officially, but this song is amazing)
2) Out of Control (One of their most energetic and powerful song)
3) The Unforgettable fire (The intro is outstanding)
3) Stay (One of Bono's best vocals)
4) Promenade (impossible to dissociate from the Unforgettable Fire track...beautiful melody)
5) Where The Streets Have No Name (do I need an explanation?)
6) October (Every time I hear this song, it soothes my soul...dont know why)
7) Miracle Drug (If only for Edge' solo at the end of the song...this song is very emotional all the way to the end)
8) City of Blinding Lights (Very epic U2...I love the piano at the beginning contrary to many U2 fans who bashed it...and Bono's "Oh, you look so beautiful tonight")
9) Luminous Times (Best U2 b-side...what can I say, the style is similar to Mercy so I luv it
)
10)Into the Heart (This song is probably the best in terms of creating an atmosphere and making us think about our childhood...short but a little gem)