Souten no Ken got much better after that Giant Guy got killed and Raoh and Toki got in
Hokuto no Ken went down when Raoh died, but that last arc with Bat was really nice.
But that's just what I think, which Fist did you like more, what did you like and dislike in each of them?
What I liked in Souten's Kenshiro was his "If you got a problem with X, then tell it to me!" catchphrase