I think the hardest fight is to fight someone skilled F4U, Vs. a 109F. No matter what the worse theng that can happen is, the 109F is going to win everytime. Can do the same to the spits as well, and turn, basically just as good. I know from countelss experinece. I don't usually fear a G6 as much, but people should fear, because its me flying it around
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I have never been afraid of Temps becasue all they can do is pick. A plane that I can fear, and I know it to be a PIA in the DA is, the F4U1-C. It turns good has a decent climb for F4Us and has thr guns of a Temp. I hate a Chog more that a Temp or Typhie.
La's are fun to beat when they don't have the speed to fight you in them. They are decent turners but its quite easy to kill them.
Most P-51 pilots cain't put enough to kill me, unless its 4V1, then I know that I have to take up a K-4, and tater them all.
Hurris are easy, they cain't turn as well with the speed so try and reverse them and take off, you know they cain't catch you.
Zekes are just another plane like the hurri, but can climb better than the hurri. I would be more afraid of a zeke than a Hurri at alt. What you can do with them is, pull a hard vertical G, and you can probably snap a wing off pretty easy.
IMO, 109 is the hardest plane to beat, with some skill.