<< 5. Erich Hartmann
4.
Manfred von Richthofen
3. Werner Molders
2. John S. Thach
1.
Oswald Boelcke >>
Boelcke I agree... Richthofen, yes..
I don't know the WWII aces, but I do remember from the game Aces over Europe that there was this one amazing German ace with over 400 kills..
now as for my top 5 WWI aces:
Boelcke, MvR, Ball, Rickenbacker (disputable yes I know but have you read his autobio?), and for number 5... I'd say Nungesser, because he survived the whole war as a flyer.