Since I'm USian, I have to pick a US aircraft (despite the fact that the USAAF operated both Spitfires and Mosquitoes....), then a fighter aircraft, and I'd want the best, so I'd pick the Bearcat. Do note, however, that the Bearcat never saw combat in WW2. Of the aircraft that actually saw combat, I'd say the Hellcat. Yes, I know that the Corsair was better in many ways, but I'm only 5'8" tall, and the ergonomics of a Corsair sucked big time for people who were not vertically overendowed. Were I 6'4", my choice may be different.