Comparing chart peaks is irrelevant. Yes, "Gimme More" peaked higher than "Ain't No Other Man," but "Gimme More" spent like 2 weeks in the top 10, compared to 10 for "ANOM." You can't compare the two. It's like saying Jay-Z and Linkin Park's
Collision Course was more successful than Kelly Clarkson's
Breakaway because the former debuted at #1 and the latter at #3 back in December of 2004.
We all know, from a US perspective, who has better singles chart performances; obviously Christina whether
some of us like to admit it or not.
Just to add, if all else fails, we can really go in depth and compare the chart performance of the lead singles off each singer's Best Of albums. I'm sure beating #101 won't be a hard feat to reach.