the spitfire is undoubtedly the most 'beautiful' world war 2 fighter.
the thing is all other fighters were designed for fighting only, the supermarine was very much designed to look perfect.
The design was universally recognised as 'beautiful' even by enemy and friendly pilots alike.
add to that the superb handling...and i quote 'you dont fly the spitfire, you strap it on!'
also in a recent book 'combat crews' by john comer he says it was the most elegant looking fighter and deadly in combat.
my personal favourite of WW2 is without a shadow of a doubt the 190 due to the fact it looks like a hunter.It has that 'about to fire' posture and is also among the best of the war.
the p51 just looks like a lumpy mass with odd parts sticking out.
the best part of it in my opinion is the guns in the wings.the rest is fairly ugly as a design for looks.In fact its as plain as a bulgarian pin up

The P38 is also a good looking plane because it was so unusual and holds a special place in my childhood in terms of a model i always picked off the shelf.
but to say its the best looking? hmmm