I must disagree with the contention that individual scores don't mean much.
I was brought up and raised to be competitive. Team sports were fun but individual performance was paramount.
I'd fight for my country either way if required, and I have, but if I couldn't count and keep track of my individual performance, it would not be with anything like the same effort. If my achievements were going to be only lumped into the whole, I'd maybe fight more to just stay alive than to win and excel. It's not just me, it's almost everyone who was brought up to be competitive. It's human nature. That's why they have awards, for INDIVIDUAL achievements. If they didn't keep track of individuals, how would they distribute such awards? A unit citation is great, but nothing like an individual award. The only team award that ever was anything like as important as individual performances was a championship. All others were nice but unimportant to the individual realtive to overall morale ... unless an individual had no awards for individual achievements. Then team awards were very important. These would be the individuals near the bottom of the individual performance ladder.
This is not saying individual performance took precedence over everything ... but it was a major factor in overall confidence and morale.
To me, the individual scores are more important for the personnel and the accurate aggragate scores are more important for military strategy and planning. You can't win with dispirited armed forces and you can't plan with inaccurate information. Well, you CAN, but it doesn't work very well. Both are important to the outcome.
I will take the aerial victory awards as awarded in the conflict, not as revised later by armchair quarterbacks. I view the very high German scores with some doubt, and compare the great German pilots to each other within their own scores, not with the scores of other air forces. For instance, Hartmann, Barkhorn, and Rall were probably the greatest German pilots relative to German pilots. Their scores say nothing to me about how they would fare versus a one-on-one with the top aces of other air arms.
Take the top 10 from any air force and match them against the top 10 from any other air force and you'd have a good fight! There might be some "Las Vegas" odds if people wanted to bet, but the outcome would be in doubt to my way of thinking if they started with equal position, altitude, and circumstance ... unless they had to travel very far. In that case the Bf 109 would be at a serious fuel disadvantage that would have nothing to do with pilot skill or the aircraft performance. That's why the Germans had to make frequent front line airfield moves ... to stay in contact with enough fuel to do something.
If you lifted Erich Hartmann and, say, Richard Bong, and exchanged them with one another, ignoring language and allegance, they'd probably perform about that same as their counterpart. The situation over the Russian Front was very different from the situation over the Southwest Pacific. If they exchanged, it's for sure that Erich hartmann would not be flying 4 - 6 missions per day if due only to the distances involved, and would very certainly not be in a "target rich environment." The skill of the relative opponents would also not be anywhere near the same. Their scores would no doubt be more in line with the area of conflict rather than the political alignment or aircraft used.