Best overall: Rage Against The Machine (self-titled)
Rage Against The Machine is probably their best album overall. The guitars are great, the vocals and lyrics are very well done.
Evil Empire: Probably the "darkest" of all the Rage album. Great guitar work and vocals, however there is a lack of creativity in the drums.
Battle of Los Angeles: A pretty good album, but it seems to be more "polished" than the other Rage album. A big step in Zack's song writing, and there are some fantastic tracks on the album.
Renegades: Although a cover album, Rage does an excellent job converting some classic songs and still manages to make a point. Probably the most creative Rage album.