Dan - my kindly, soft spoken, cocky old man had a chance to fly several LW ships post war when the 355th was at Gablingen.
One of them was a D9 which he got some 15-20 hours doing some ad hoc field trials against the 51D-30. He liked the D9 (liked the 51 better - what a suprise - stock answer), thought the 109 was 'dangerous to the unitiated', but remarked that he had heard of both the the Ta 152 and the Do335 but never had a chance to fly either one.
He enjoyed the Fw190 most of all as a 'pilot's' airplane. He didn't remember which version except that it was armed with only two 20mm cannon in wing and thought 15mm under cowl - so it wasn't an A8.. actually it could have been an F and he may not have known the difference.
The difficulty in these types of threads (back to topic) is that even while this forum has categorized well specific MISSIONs that the fighter/bomber/pick one, is discussed, grappling with the BEST is still subjective - so I guess that is why this is called a Forum..
As much as I think and believe that the 51 was the most IMPORTANT fighter that opinion is equally based on what I thought was the most important MISSION for airpower in WWII - namely the destruction of the LW and German industry
If you twisted the objectives to be met by the BEST or MOST IMPORTANT to include for discussion only those fighters which performed well at every role then you immediately narrow down to Carrier based fighters that also acted in Interceptor, Long Range Escort, Fighter Bomber, Recon, Night Interceptor roles - real short list here.. you end up with a fighter which starts with F and ends with a U or F
It is only after many years of bliss in my opinion that the 51 was the BEST that I am cringingly concluding that that title deservedly belongs to the F4U-4 or 5.
Bill