The most survivable . . . hmmm . . .
I'd say the P-51, La-7, and FW 190D-9, since they are the fastest down low and have other attributes as well.
For sturdiness, the A-20 is by far the sturdiest plane that can be used as a fighter (although it might be disqualified since it's not classified as a fighter). The P-47, F6F, and F4U seem quite sturdy. Maybe the P-38, too.