I honestly don't know enough about either to have an opinion that matters but the way I see it both are/were highly respectable for different reasons.
Bill for being a computer genius and Steve for being a business genius. I would guess both are/were probably way stronger in both categories than any of us will ever be in either, but those are the immediate traits that come to my mind.
I guess at a personal level, I'm more inpressed by Steve because his particular defining strengths are the ones I don't have. Business, marketing, etc. Nit that I woyld compare myself to Bill in technical prowess but that's at least a field I know
something
about.
But on the other hand, I'm definitely a Windows guy, so...
Tough call, I guess.