I know the highest scoring allied Ace had 66 kills to his name, but around the top 50 WWII aces were part of the Luftwaffe, most using the BF-109 E-G variants. Erich Hartman had 352 kills to his name, almost six times as much as the highest scoring allied ace, Ivan Kozhedub.
These links should not discourage further responses, but these older answers may help answer your question:
by u/Domini_canes:
https://www.reddit.com/r/AskHistorians/comments/33yvrs/why_did_the_wehrmacht_and_luftwaffe_have_so_many/
https://www.reddit.com/r/AskHistorians/comments/1i08zw/why_did_german_fighter_aces_inwwii_have/
by u/eidetic:
https://www.reddit.com/r/AskHistorians/comments/24jgyf/why_did_german_fighter_aces_have_so_many_more/
by u/barath_s:
https://www.reddit.com/r/AskHistorians/comments/3ixxop/why_did_germany_have_so_many_fighter_aces_in_ww2/