Definitely Kurt....
...for so many reasons:
(1) His pushing of existing technical boundaries during his amateur career (quads and several triple/triples for the men)
(2) His good sportsmanship in the face of 2 immensely disappointing Olympic skates (does anyone else remember how classy he was when he was interviewed after literally stepping off the ice after his triple axel fall in the SP in Albertville?)
(3) His versatility in both his amateur and pro days -- looking back on all his programs, Kurt has successfully interpreted and skated to almost every kind of music there is, with subjects ranging from the very serious to the very silly.
(4) Picking up where Scotty Hamilton left off with mind-boggling footwork sequences -- I have a tape of the GPF finals from 2001, right before the Olympics, in which Dick Button is praising Yagudin's MITIM footwork sequence, and refers to Kurt as the master of that kind of short, staccato footwork.
Yagudin is definitely a close second for me!