This ones hard ... I love their first three albums equally, and have always had a hard time picking a favorite out of 'em.
That being said , I'll go with Blessed Are the Sick.
I had a hard time choosing between Altars, Covenant, BAtS, and FFttF. BAtS is definitely their most diverse album besides their newest album (which is great). Trey did a superb job of adding a classical element to Death Metal.
Wait, what?
He's obviously talking about Heretic, as that's their most recent album.
Wait, what?