The
F4U-1C has 25173 kills and has been killed 18059 times.
The
N1K2 has 11872 kills and has been killed 11545 times.
Yeah, that N1K2 sure is up there with the F4U-1C isn't it? I mean, its got a whole 47% of the kills that the F4U-1C does.

Yeesh.
Other samples:
The
Spitfire Mk IX has 10714 kills and has been killed 11363 times.
The
Ostwind has 10369 kills and has been killed 4797 times.
The
La-7 has 6757 kills and has been killed 5454 times.
The
Ship Gunner has 6504 kills and has been killed 13 times.
The
P-51D has 5894 kills and has been killed 6464 times.
The
Bf 109G-10 has 5058 kills and has been killed 4375 times.
The
F4U-1D has 5063 kills and has been killed 5669 times.
The
PT Boat has 4772 kills and has been killed 7870 times.
The
Panzer IV H has 4572 kills and has been killed 3641 times.
The
Fw 190D-9 has 4505 kills and has been killed 3030 times.
The
SeaFire has 4195 kills and has been killed 5441 times.
It seems to me that there are three distinct groups at the top. The contents of the groups might vary depending on the map, but the level of the groups seems consistant. The groups in Tour 15 seem to be:
The clear top group (not really a group given it only has one unit i it) consists of:
F4U-1C
The 2nd group contains 3 units, clearly below the top group and yet clearly above the lower of the top three groupings:
N1K2-J
Spitfire F.MkIXc
Ostwind
The bottom of the three groups contains the rest of the commonly used units:
La7
Ship Gunner
P-51D
Bf109G-10
F4U-1D
PT Boat
Panzer IV H
Fw190D-9
Seafire
All other units in AH have less than 4000 kills. Only the Italians lack a unit in one of these top groups and the Russians and Japanese only have one each (admittedly the Japanese have the 2nd place unit).
Adding the G.55 and Re.2005 might give an Italian fighter a shot at entering the third group.
Adding a Ki84 might significantly reduce the N1K2's frequency.
Adding a Yak3 might give the Russians another top performer.
Changing the vehicle armor might reduce the number of F4U-1Cs.
For humors sake:
The
M-3 has 416 kills and has been killed 1401 times.
The
C.202 has 255 kills and has been killed 502 times.
The
C-47A has 184 kills and has been killed 3303 times.
------------------
We few, we happy few, we band of brothers;
For he to-day that sheds his blood with me
Shall be my brother
Bring the Spitfire F.MkXIVc to Aces High!!!Sisu
-Karnak