For pure evil appearance you can't beat the B-1.
For unadulterated intent to do harm, I'd go with F-15, but the ME/BF-109 series looked the part long after they were obsolete.
For pretty, the F-101.
Raptor makes points on clean and effecient.
Finally, the A-1 stands at the head of it's very own class, utterly without competition.
The F-4 was proof that a brick can fly if enough power is applied.
I beg to differ -- for pretty, I go with the F-15 Eagle, followed by the F-14 Tomcat and the A-10 Thunderbolt.
Are you talking about the A-1 Skyraider?
I try to keep my picks in the modern jet range -- mixing props and jets is comparing vastly different aircraft.
But TIMHO.
Hawker Tempest