P-38
Because the skilless dweebs cant fight in it
Because the skilled vets cant run in it
...and thus they dont fly it.
Because the P-38 can be both an E and T&B fighter
...it will outrun anything it can't out-turn and out-turn anything it can't outrun.
Because the P-38 can be both an excellent fighter and an excellent bomber/attacker.
...whereas the rest of the planeset cant.
Because, as in real life, only the best fly the P-38!