Best looking :
Definitely the F-5E...
Ugliest : BF-109.... But it isn't in a bad way.. The 109 looks like it WANTS to kill you..
Lol. My sentiments almost. The F-5E, F-104, definately my fav jets. With a few others of course.
P-38 and P-51 for WWII and props.
The BF-109 family indeed comes not as classic beauty contest, but there are some way more ugly ones IMHO.
Some early bombers e.g. look like they are the attempt to make a motorized dinner table fly.
For the 50s:
The Sabre family, especially the Canadairs, combining elegance and 50s sport style with power.
I will not post links and videos, otherwise I would spam this thread all night loong.
Just one..
Or two..
Carry on..