Three options for me.
1. Flying a Jug in the ETO. I wouldn't be the type to want to avoid the fight. I'd want to hurt the enemy every way I could and there wasn't a single airframe I can think of that did everything as well. It could dogfight, it could escort, and it could deliver massive pain to ground targets. it was also comfortable and robust. Having confidence that the thing could take a beating and bring me home would make me a much more dangerous in every aspect of it's role.
2. Flying a Hellcat in the PTO. For many of the same reasons I'd choose a Jug.
3. A C-47 pilot in just about any theater. The DC-3 made a greater contribution to the war and beyond that any other single aircraft I can think of. Flying the hump, dropping troops, delivering supplies, towing gliders, the Berlin airlift. Like it or not, logistics win wars. You can't fight without ammo, food, fuel, and people. The goon did it all and is STILL doing it as I write this. I can't think of another aircraft which can claim that.