Metallica over Megadeth because my Rust in Peace CD has several "bonus" songs, one of which is that annoying "It'ssss aliveeeee....." one and I get fed up with always having to skip four tracks when the album reaches the end. Whereas the Metallica CD's don't need any babysitting once they're in the player. Top choice is RTL because so far it's the first three albums or bust for me, KEA and RTL are stronger albums than MOP in my opinion, I enjoy the production of RTL more than KEA even if it is more scooped, and KEA had some vocal lines I found mildly annoying. Been spending some more time with KEA though to try to get past those quibbles, as it seems like the songwriting itself might be stronger than RTL.