i will say the 37mm was used consistently and in huge numbers. the 50mm on the 262 was an experiment and not that successful...and not used largely. the larger canon on the mossie...i dont to what degree it was used. i would have to throw my hat on the 37 due to its success rate and was not only used in P 39s but the soviets had such good success with it they carried its use into their ac.
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