The top Allied ace in western Europe, Johnnie Johnson (39 kills, all single engined fighters, Spitfire Mk IX) was once asked by a journalist why he hadn't gotten as many kills as Hartman. His response was that he hadn't seen that many enemy aircraft in the entire war.
There was nothing inately better about German pilots or German aircraft and if the US, UK or Russians had been facing the numbers they would have had some pilots with kills in the same range.
But it was the Germans that were flying in a target rich environment (aka, losing) and flying until they died.
Thus the scores.
FYI, highest confirmed score by a non-Luftwaffe pilot was by 94 by Ilmari Juutilainen of the Finnish Air Force.