My vote is for Donuts, I love MV a lot too, but only more recently did it click for me. Donuts is so full of great and powerful ideas and the soul element to it is what draws me to it the most perhaps next to the drunken drum patterns that fit so well.

Donuts - 1
Madvillainry - 2

Beginning to make a fight of it...

Madvillainy (no r) is pretty much perfect, but I'm going with Donuts. The album starts by establishing Dilla's journey as an artist to get to the new sounds he was putting out before there seems to be a realization of something being wrong. From there, the album is a sequence of ruminations on his life/death, desperate last hurrahs, bouts of horrible sickness, fleeting dreams and memories, messages to those he's leaving behind, and a final acceptance of death. It's an emotional rollercoaster, and even if it wasn't, at its core it's a stellar collection of beats.

Donuts - 2
Madvillainy - 2

I'll break the tie.

Madvillainy.

Sh*t just goes harder. Perfect blend of clever lyricism with saucy instrumentals. I do prefer Entroducing over the the two though.