He was saying in that Sway interview that MBDTF is a "top 10" hip hop album ever, I'd assume he thinks that's his best work. Other than that though, I assume he loves all of his albums equally hahahaha.
If he did say that, I hate Kanye even more. I honestly don't know why AP loves him so much. Almost all hip hop fans I encounter in my day-to-day life find him insufferable.