Please feel free to differ.
If you insist.
All variants of He219 and Me262 shot down between 600-700 Allied aircraft. The others barely made an impact
Only because the Allies had absurd amounts more...which is outside the scope of this thread.
29 Soviet aces flying the P-39Q Airacobra alone were credited with shooting down fifteen or more enemy aircraft. The top sixteen aces shot down 456. The remaining aces were credited with 195. That totals to 651 WITHOUT EVEN COUNTING the P-39Q pilots who scored one to fourteen victories.
How many non-aces scored in the P-39? And how do we know that those claims were even verified?
How many they actually shot is moot, as it is with all air combat - most underclaim, some overclaim. The cannon armament of the P-39Q meant a victory was more certain than a aircraft solely fitted with machine guns.
I'd say how many were actually hit is important. As to the cannon armament it was very low velocity, so hitting with it was incredibly challenging, much more so than the rest of the aircraft's guns.
I'd sooner have a P-39Q or Bf109G today than a FW190C in 12-18 months.
If money and resources were unlimited I'd have a P-51B or Sea Fury FB.11 - perhaps the latter with a water-methanol injected R-2800.
What I would not have, is an overcomplicated aeroplane designed by Nazi sympathisers and built by slave labour. I don't have a death wish.
Again we're talking about a hypothetical aircraft buildable with 1943 technology, so it would be available today. I don't get what you think you're arguing here?
Also when did the P-39Q even enter service? I'm seeing 1944 on wikipedia, but it's pretty sparse on dates for individual variants.
In terms of build quality, OP says that is not a consideration here, so I'm not even factoring that in. If you're going to have to appeal to issues outside of the OP to make your case, then we're talking about different things.
In any event in terms of technology quality without material considerations there was a lot of quality options to pick from, you have your preference, so why not leave it at that rather than get all butt hurt about people making different technical choices than you?