LR by a large margin.
Late Registration. The sound selection is timeless. It came out in 2005 and still sounds great today.
There's a few songs on GKMC that haven't aged well production wise, probably the only downside to that album. Shows the importance of great drum selection
GKMC
Personally I rank LR a bit lower in Kanye's discography, probably like 4 or 5. Not that it's not an amazing album, just I prefer CD or MBDTF or Graduation