Definitely one of my favorite/Top 5 albums of ALL TIME, and it's hard for me to compare Disc 1 to Disc 2. As a concept album, I rarely compare the discs, as it runs/plays continuously for me when I listen to it, beginning to end. Sure there's some great songs on Disc 1, but Disc 2 has some great playing and a few good songs too.
If I had to "rank" them, Disc 1 would be 10/10 and Disc 2 would be 9/10, making the album a 9.5/10, which is pretty damn good IMO.
-Marc.