i think there are far to many factors that this anayiss ignores. to why people play axis (or allies for that matter). when the soviets were OP as fuck at one point i was still consistently seeing more players playing germans than soviets. (this was b4 okw) atleast in my search bar. (that said tha percent thing doesn't tell you all that much about the overall game.)
because of the historical ties of the factions we have that pulling for why people play each faction as apposed to just i like this style of play or that. which i won't go into because discussing politics sounds like a bad idea unless ofc you want the thread to turn into a shit fest.
that is just one of the more unique reasons why you play one facton or the other compared to most rts which are set in a fantasy setting.