Well, I'm listening to Peace Sells now. On "Devil's Island" right now. Man, the two Daves beat Metallica in the great thrash war singlehandedly in my book. Ride and Master are good albums, and I like what I've heard from the black album (the hits), but so far, Peace Sells and Rust in Peace are nothing but gold, and they're much more energetic than the Metallica stuff. I just want to run around and punch all of my neighbors in the face.
Plus the riffs are just more interesting, esp. on Rust. I'm kind of scared to check out Countdown, since the only track I've heard from that is Symphony of Destruction, which sounds a lot slower and straightforward.