Billups is good and he is really compatible with the Pistons. I haven't watched much Pistons games due to my lack of cable but from watching last seasons as a point gaurd he doesn't seem as generous as Nash does although he's no Kobe(king ball hog?) I would say he does what his role is on his team. The Suns overall pass it alot more than most teams, which fits in just fine with Nash.
1v1 I wouldn't be able to say, but they both do for they're teams what they're supposed to.

Oh ya. http://www.nba.com/suns/news/marion_060301.html
Saw that coming.