They were all dope, but Gotti and Ras were kinda at their best at different times.
Kurupt was ridiculous up until around '96, then he started slipping a little. But that's when Ras was probably at his best, lyrically. Those two could have easily been on a lot of top lists for lyricists during the mid-90's. I've always thought Xzibit was a dope artist. His first three albums were really dope, but I never considered him to be on Ras's or Kurupt's level with the rhymes.