I'll add my vote for Wilt. Sheer, nearly unstoppable dominance when it came to putting the ball in the basket. His only kryptonite was, of course, Russell (who arguably was the greatest defensive player of all-time). But outside of games against Bill, Wilt was seemingly without boundary to what he could do on offense.
And it wasn't just scoring. Wilt was an amazing passer (has any other 7 footer lead the league in assists?) and, of course, vacuumed up offensive rebounds like crazy. He constantly commanded double and triple teams, creating space and match-ups for his teammates. He'd still be an overwhelming offensive force even in today's game.
Heck, even Russell didn't really stop Wilt (29.9 ppg against Russell) so much as allow the Celtics to not have to double-team Wilt, which kept the rest of his team in check (leading to Russell's 57-37 W-L advantage).