Well, number of kills isn't always everything. Like some had better planes then enemies, better tactics etc. All the 200+ kills were made in the eastern front coz russians sucked, but RAF was strong and there weren't many pilots who kill over 100 planes in the west. And some just didn't have time to fly due to duty as General.(That part was for germans, coz they had all the top scores, 2500+aces;) ). And some like US pilots just didn't see the enemy too often.
But then again it's a poll and I was looking for what u think so I can't blaim u if u go for Harmann, coz 352 is a HUGE number!
Anyway, I would like it if u'd add why some1, is it coz of the numbers or his flying skills or what ever