I don't really have a favorite. For a while I was a student of the 190 series, and then I stuck to the Ki's. I tried using Navy fighters for a while but abandoned all but the FM2 for everything except close range, down and dirty fighting in the weeds or on the waves. I have taken quite a few SpitXVI's with it, and I even recall nicking a 163 with it once.
But the planes I really found myself using ALOT before I kinda just egressed from flying for a while (account is deleted, haven"t payed in months) were the P47, the Ki's, SpitIX (only when I couldn't decide, I used to despise spitfires), the Ta152H, and when I'm feeling frisky, the P-39. I love the guns on the P-39, it just feels fun. Plus it sounds better than alot of planes, which I think seem to use the same engine sound. But that might be due to similar engines.
As long as I was in a good fighting position, the 152 was a very comfortable bird to fight in. I actually tended to prefer it for low level dogfights for a while, and truth be told some of my experience from practicing in 190's carried over well. It can roll like nobody's business, let me tell you. A story I often tell about this bird, and any other that has a hub mounted MK108, is when I landed a tater up the tailpipe of a Yak at D800 down on the deck. I was grinning so hard I had to adjust the headset.
On a side note, I don't really like the P-51. I tried flying it at high alt, but it just felt sluggish. The P-47 definitely responds better way up there.