I vote the FM2. I call it "the nimble pig". It shrugs off 50 cals well. In a furball I treat 303 or 50 cal strikes as "turn indicators". I fought CFYA(and lost horribly) one night Hurri mk1 vs FM2....let's just say I presented a target the entire time and he didn't miss much, yet the fights lasted a while. Of course they were 303's, but still I think he put about 2000 of them into that FM2 before I started losing all my parts. F6F's are sturdy as well, but the engine gets shot out by ack quite easily(just my opinion).