since he got the most killes, he is the best german fighter pilot during ww2.
By the way, I herd that he shot down much less than 352 enemy planes, because it depended on the amount of engines that the enemy plane had. so if the plane had 4 engines, then it equals 4 killes if the plane had 2 engines it equals to 2 killes and so on...
so actually this isn't killes, it's more like points (I don't know if it's right or wrong). As far as I know only the Germans used points to count how many enemy planes were shot down.