Still trying to understand guys like buffnut453 and @P-39 Expert, for what it's worth.
For the record, the Buffalo is nowhere near my favourite aircraft...I just find its conflicting combat record fascinating.
My all-time favourite is the Mosquito. The epitome of "if it looks right, it flies right".
Now...to get things back on track, my favourite late-war fighter would likely be another de Havilland product...the Hornet. Yes, I know it's just squeaking in at the end of the war...but it's close enough for me to self-justify.