I have to say that these 2 are my all time favourite rock guitarists, the way they can pour so much emotion into a song with their playing. But, whos the best any why? What makes one better than the other?
Technique wise I cant see how either of them could improve that much, so whos better and why?

Personally I think Slash just edges it, I think his solos just slightly tip Richie's, but I don't know why, just like the sound I guess.
Also, if anyone has heard Jacko's Give in to Me, Slash's guitaring on that song is sooo sooo soooo good.