[snowwrestler]

The engine and the warhead are two of the biggest challenges in making a missile, in large part because anything high performance is also going to be spectacularly dangerous to manufacture.

[beAbU]

Guidance is by a huge margin more important. The best engine and warhead is meaningless without a means of hitting your target.

[CryptoBanker]

I disagree. A missile without guidance is a rocket which definitely has its uses on the battlefield.

A missile without propulsion is at best a bomb which doesn't do much good without an aircraft to drop it from