There are too many fine planes to chose from that I could name a single favourite.
Only if it were just about beauty, there would be only one choice: The Ta-152H spreads its wings like an angle
an angle huh..... well it is your second, or is it your 3rd language?
Does British English still count for a language?
On topic, I agree with Lusche/Snailman on the difficulty of the selection. It is a rock-paper-scissors dilemma.
1. Yak 9U all around. Fast, small, excellent visibility, good acceleration.
2. Ki-43 for slow, low turn fights.
3. FW 190A-8 for bomber killing; though, the Me 410 with extra 20mms is a strong second.
4. Tu-2S for bomb**** runs.
5. B-26 formation for bombing. Copious tail gun ammo.
6. Cruiser guns for cv killing.
7. M3 with supplies, because I am gv challenged.
8. P-40C for the AVG skin.
People who don't go through the hangar for a different ride once in a while are missing out on a lot of what Aces High has to offer.