These are so fluid -- they are mostly an expression of how I feel at a particular time. For example, before NLOTH and SOI was pretty sure I liked POP more than anything. Now I find War up there because I'm listening to it a lot recently.
1. Achtung Baby (sonically and spiritually their finest masterpiece, and the sound of U2 chopping down that god forsaken Joshua Tree)
2. War (I mean it has The Refugee -- the song I blew my car speakers on)
3. Songs of Experience (Similar to but better than ATYCLB -- doesn't have the hits but the deep cuts are oh so good).
4. All That You Can't Leave Behind (because it hits me with the feels and tears)
5. Boy (the most important U2 album)
6. The Joshua Tree (nice picture of America, but my country pisses me off, and this puts it too much on a pedestal. Plus old folks still think it's their best work and that pisses me off too)
7. The Unforgettable Fire (A Sort of Homecoming, Pride, Bad, Wire, and Elvis Presley and America -- especially Elvis Presley and America because it just feels so good)
8. Songs of Innocence (as a narrative the most cohesive U2 album ever put together and it has some real gems)
9. Pop (less interesting to me these days, but still an album I listen through and through)
10. Zooropa (less interesting to me these days)
11. No Line on The Horizon (after SOI I realized how undisciplined U2's song writing was on this record. I used to hold it in higher regard but now it's just TUF without the greatness).
12. Rattle and Hum (these songs were cool when I was a teenager, but now sound too stuck in the past)
13. How to Dismantle an Atomic Bomb (Vertigo will always make me rock, Original of the Species is one of the best U2 songs -- but the rest don't feel timeless)
Catorce. October (I still love you -- just not as much as the others, you unfinished sketch of a better album)