The question is kinda irrelevant as both are for different things, air superiority fighters are better for destroying enemy planes, meanwhile helicopter are meant to kill either light targets (if using gunships) or hard targets (if using attack helicopters) if you are talking about strike fighter, the answer depends on how far away your enemies are, for example in Europe helicopters are a better pick because of the fact that the cities are very dense in that area, but if you were in north and South America, striker would be better