I fly the F4U-1 a lot. I have hardly ever flown the La-7, but I have flown against them a lot, of course. I think the La-7 is perhaps the better plane for Main Arena conditions. It's faster, climbs better, rolls well, has good firepower, turns well (although it can't match the low turn radius of an F4U-1 when the F4U-1's flaps are deployed), and can dictate the fight then disengage if things are going poorly.