Practical example: Axis has higher winrate than Allies on 4v4 but Inka Tournament showed Allies dominating axis. Why? Could it because Allies only gets good at super high level play? Who knows.
The last tournament was dominated by allies because pathfinders and maxim spam were untouchable. Since the paths give sight for the maxims nothing could attack them. This setup can only happen in a tournament setting.
Axis are easier to tech, have early sturm/kubel pressure, and tend to do better in rando games. Unless you get all OKW vs all Brits then its a severe beating for axis.
None of this is fact (are there such things?). Just observations and listening to players much better than myself. So I tend to agree with PagePs stats in general.