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Gotta say, chapter 9.3 and 9.6 are an awsome way to get easy xp for me,especially with the new challenge mode. 9.3 is a hand ninja stage, so they can't have a good block for a bruiser(perfect to upgrade Hercules). Scrappers( Ghost rider, Quicksilver, and for those who were lucky and weren't me, Deadpool) can also gain high xp for all the inf. on the stage, and you can always add Beast for good measure.

As for the premium stage? The mindless are again class imitators. Hitting them with an AoE with and inf. and them continue with a scrapper makes the battle easily yours.