I love all three of those albums, because they're all very different albums.
One could argue that the lyrical content is relatively the same, but to me there is a distinct mood I get from 7 Day theory that I don't hear on the other two, and vice versa. Tupac evolved as an artist, he was true to his craft.
I've said on here before that I think
Spice-1 -Spice-1
Spice-1 187 he wrote
Spice-1 -Amerikkkas nightmare
are classics.