I believe that, apart from the quality of the songs, the structure of the album (the 'storyline' or just the order of the songs) are also an important factor when rating or comparing albums.
And while I believe that the UYI II has more (or on average) better songs than I, I prefer the "storyline" of I.
It starts with a great, rocking opener (RNDTH) which kind of give the direction of the album. It is followed by a good mix of quality songs, that already include one major hit (Dont cry). In (about) the middle of the album you have the climax (November rain), but you still have some good songs to follow upbefore the album is concluded with a great closer (Coma) which leaves you with your mouth open.
II on the other hand is a bit messy: Civil war, while being a great song, is not an opener (could you imagine GnR open a concert with that song?). While some nice songs follow, you have kind of a let down with GITR and Shotgun blues. While not really bad songs, they lack in songwriting and atmosphere compared to the rest of the album. After that, three creative and exmperimental songs follow in a row, which are definitly fan favorites, but not really big hits. The album lacks a climax here, like UYI I has with NR.
And the end is the worse part: After Estranged, I always feel like the album should be over. When then, out of nowhere YCBM appears, maybe the best rocker of the album, it is nice to hear the song, but it doesn't really contribute to the album's storline. Maybe only apart from hyping up for a song that you have already listened to (Don't cry) or a song you don't want to listen to (My world).
That being said, I would have preffered the songlist to look a little bit like this:
1. Pretty tied up (Great opener)
2. 14 years
3. YCMB (similar to UYI, have the "hit single" as one of the first songs)
4. Knocking on heavens door
5. Get in the ring
7. So Fine
8. Civil War (Great and popular song serving as the climax)
9. Shotgun blues
11. Don't Cry
13. Estranged (for me, it is the counterpart to Coma, and therefore closing with that song would create a bridge to UYI I)
(Hidden track: My world)