Well, I watched nearly every Leeds match home and away from 1966 to 1985 and would say it's Billy Bremner. The most skilful, though, has to be Eddie Gray. There isn't a winger in today's football who can glide past defenders like Eddie.
People over 45 would probably say John Charles or Bobby Collins but that's even too far back for me.
As for post-Revie players, I'd say the most influential has been Gordon Strachan, and in today's team (but maybe not tomorrow's) I'd go for Lee Bowyer. I'm still mad at UEFA fir suspending him for that match against Valencia.