Looking at this months LW stats I figured I'd throw some numbers out for discussion.
K/Ds. Some higher eny airplanes post really good K/Ds, all things considered, simply by attracting expereinced sticks who want more challenge.
This month the Yak-9U has a 1.09 compared to the LA-7s 1.08. Surprised? not really, pretty much an accurate reflection month by month.
The P-47-D11 is posting a K/D of 1.32, leading all the Jugs, and beating the 8 eny Mustang which is at 1.15. P-47-D25 k/d 0.95. D40 = 0.90. "N"= 0.72. Course the razorback is the darling of some good squads and some good jug sticks.
Nothing surprises me with the 109s. Even the F-4 is at 0.96. G-14=1.12, G2= 0.92, G6=1.05, K-4=1.38. The Spit-16 so far this month? = 1.10 .

KI-61 is shooting a 1.18 while the KI-84 is posting a K/D of 1.25. Even the Zero is posting a respectable 0.90 .
The C-205 is at 1.05. The F4U-1A is a 1.26. The FM2 is at 0.90 in LW even tho its as early war as you can get.
The 190-A5 is at 1.23 . Not bad. Especially considering the Niki is at 1.19 . The P-38J is posting a 1.46. Even the P-40E is posting a 0.80, not far from the LA-5s 0.84 .
The Spit-4 is 1.18 LW Tour 110. The 8 is at 1.00 . 14= 1.37.
Its really at a point where Im more leery of certain high eny airplanes then the low ones. Lately Ive been enamored of the Yak-9U. No Im not clearing out the sky with it but I have found it to be an airplane that can enter any low eny fight, even at bad odds, and fight hard. Then getting you home to fight another day. In real life the Yak-9 was a great, great design as well and I have found it to be a great higher eny addition to this game.