Germany with strong bombers and fighters that have alot of attack stregnth?
UK with expensive bombers that do tons of attack but small cheap fighters?
France with the ability to obtain large amounts of decent, inexpensive bombers and fighters?
Russia, with the largest bomb blast radius but only dropping two bombs? Also with fighters that are cheap but created quickly.
Or USA with bombers that make two runs (with tiny blast radius) and the best fighters in the game?(because of the range)
My vote would be for the USA, because of the ability to create paratrooop planes and the number one fighters, although the bombers are terrible.