Switching to the "most handsome" issue?
My choice is simple and fast: The Butcher Bird, the Dora (Fw190 D) and the Ta 152.
I am also heavily attracted to the Bf109, especially those of the G series and the very clean shape of the K´s.
From the allies the Spitfire is the cuttest (very elegant as well.)
The Butcher Bird rules. Such a strong, sound and elegant line. Additionally, it has in my opinion, along with the Me 410, the most agressive look displayed by any plane of the war. Perhaps the Me 410 can go even further, it has a sinister look.
As to the USAAF fighters, while I do not consider them ugly, I do not find appealing at all.
The soviet La-7 looks very good in the profiles I have seen in books; however, my view changed when I saw gun camera footage and real photos: it is actually ugly, like if those men in the assembly lines had it assembled very hastily and without any great care.