Of the fighters I most often run into, the F6F and the P47, at least the P47 now, take the most focus of fire to kill.
I agree with a previous poster, the first time I saw a Hellcat up close, it was kind of a mind job. I'd always thought of it like an F4F, which I had also always considered to be a smallish fighter, sort of envisioned it to be the size of a Hurricane.
Heh, when I saw the Hellcat, it just didn't compute for a few seconds. It truly is almost as large in dimensions as the P47, and it's pretty heavy as well fully loaded. The cockpit seat looks VERY tiny up on top of the Hellcat's airframe, and it sits much higher than the impression pictures give it. A very very large fighter, which probably added a lot to survivability and pilot confidence. I know if I was in WW2 the Jug or Hellcat would be the fighter I would want to be at war in, with a nice big reliable air cooled R2800, lots and LOTS of ammunition, and a very rugged frame that could absorb a lot of punishment and g forces.
edit - I would also say the Mosquito, I'm sure in R/L being constructed the way it was it was pretty resilient, although the motors being liquid cooled perhaps caused the odd incident where dual rad hits made getting home impossible, but I would bet that was pretty rare. Being fast, as in real world fast, not video game fast, as it was when it was flying in WW2 prior to a lot of the real speed demons coming around, I'm sure that added to survivability, but in terms of taking hits, I bet that plywood was tougher than you would think.