AG with the original being a close second. THE DP AND BW outfits are just modified versions of other peoples clothes and Ash really doesn't look that good in BW.
The AG outfit really helped show that the series was a fresh start and that most of the old stuff was being left behind. The hoodie was just pure win and the outfitlooked the most normal of all his clothes. Like, I could go outside and see someone dressed in a similar manner.
The AG outfit also made him look older in my opinion which was a good thing, before we found out he was still a freaking child.