In reply to JBlackout:
FWIW, the book "Seven Summits" (a nice coffee table book and about as close as i'll get to completing them...) grades the continental high points on a scale of 1-10 for difficulty (taken to "encompass technical difficulty, strenuousness, physical hardship and altitude")
on this scale, Denali via west buttress gets 7, and Everest via the south col gets 10.
could be rubbish, but written by Steve Bell, who has done both, so he is alt least writing from personal experience