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Either Episode 4 or 5, really just depends on if I'm having a good run against the worms or not. 5 is just an unpleasant spike in difficulty in general.
This, pretty much.
Leaning more towards Episode 4 because of the difficulty it takes to get AAA Rank, which requires almost no use of the Retry option on Insane, whereas Episode 5 is divvied up into bite-sized pieces, more or less.