Either DataFrame can be broadcasted. Their results will be identical in result and efficiency.

DataFrame B should be broadcasted because it is smaller and will eliminate the need for the shuffling of itself.

DataFrame A should be broadcasted because it is larger and will eliminate the need for the shuffling of DataFrame B.

DataFrame B should be broadcasted because it is smaller and will eliminate the need for the shuffling of DataFrame A.

DataFrame A should be broadcasted because it is smaller and will eliminate the need for the shuffling of itself.