I like them all. I dont think I have ever seen an airplane I didnt like. In the MA I tend to go on streaks where I fly a certain airplane almost exclusively for awhile. Then after a week or two, I switch to something else. Of course there are the standbys that I switch to when I need to accomplish a certain task. Then there are my all time favorites, the ones that I just keep going back to.
F-4U: When I was a kid, the Corsair was my favorite plane period. It looks cool, had an awesome kill ratio, and was feared by the Japanese (also by its student pilots). If I was as rich as Bill Gates, I would own a real Corsair instead of a business jet. (actaully if I was that rich, I would own a Corsair AND a jet) In AH, I use the D for ground attack, but for some reason I like flying the -1 a lot too.
P-47: The Jug is in close contention with the Hog for my favorite WW2 plane. In real life the Corsair and T-Bolt possess many of the attributes that I would want in a fighter: exceptionally durable, reliable, roomy and comfortable, and fast.
In AH the P-47 is the very best for attack missions, carrying a ordnance load that rivals some bombers. It is then capable of defending itself once the bombs/rockets are gone. I set my personal 1 mission kill record in a P-47d-30. (10 kills + numerous acks and town building destroyed.) I have had streaks better than this against pt boats or ground vehicles, but against actual fighters this was the best.
C.205: From the first time I ever saw a C.202 in the Smithsonean Air and Space Museum I have thought that it was one of the most beautiful fighters ever. The stories of Allied pilots that flew captured examples confirm that it was an extremely sweet flying aircraft. If the Mustang is the Cadillac of the skies the Macchi is the Ferrarri. When I read about the C.205 with its superior armament and speed, I liked it even better than the 202. In AH this is undoubtedly the most underrated fighter. It isnt the best at any one thing, but it does almost everything well in air-air combat. Not only that, but you get really good perks for using it.
C-47: This is my oddball pick. Historically speaking, I believe that the C-47/DC-3 would make anybodys list of top 10 greatest aircraft of all time. In air combat its mostly a target, and gets little respect from a fighter that sees one, yet it does something that no other plane in here can do, it captures airfields. Flown correctly, you can on rare occasions embarass an enemy fighter in one as well. I started practicing dogfighting in a goon after one successfully evaded me for several minutes when I first began playing AH. You can really frustrate a fighter pilot in one sometimes, using the slow speed and tight turning circle to advantage. I have 7 manoever kills in the goon to prove it, and Im here to tell you that there is nothing quite like the feeling of taking a goon to an enemy base, dropping troops, then getting jumped by 2 enemy fighters on the way home, and having both of them auger while trying to get a shot on you.
Other favorites:
FW-190 d9 (probably the best air-air fighter for me although I didnt like it the first few times I tried it)
Bf-109 G10 (climbs like a homesick angel)
B-26 (best bomber in my opinion)
Mosquito (great for ground attack)
Typhoon (my choice for dealing with gvs)
Tempest (my favorite way to lose perk points)
Hurricane (defending vulched fields, and shooting gvs)
Ju-88 (town flattener par excellence)
Me-262 (its nice to be invincible sometimes, just stay away from ack and bomber gunners and refuse all HOs)
La-5 (underrated but a nice ride)
P-51 (who doesnt like the Mustang)
I'll stop here because this post is getting too long, I will just say that I like them all, but the 4 that I listed above I love the best.