Late Registration gets my vote because it's everything that critics painted MBDTF out to be. MBDTF is a great album, but it's more pretentious and less organic than Late Registration. With Late Registration, Kanye didn't simply just try to push the envelope, he did it. He didn't have to market the album as something that was ground breaking or revolutionary, the music spoke for itself.
With this album, Kanye proved that he wasn't a fluke as an artist. He proved that he could take what he was great at (looping up soul) and expand upon it. He not only proved that, but he proved that he could be successful while doing it. The album was packed with great music:
Crack Music
Roses
Heard Em Say
Touch The Sky
Diamonds
Bring Me Down
Gone
Late
IMO, this is Kanye's best album.