ChainsawAsh said:

Again, the Nostromo is a space semi truck that looks like it was made before any of the crew from Alien were born. The Prometheus is an extremely heavily-funded scientific research vessel. Of course it's going to have better technology.

Like 005 said, the Nostromo is probably older than the Prometheus, too.

This is an explanation I can get behind. It's the "get over it, it's a 2012 movie, they can't have CRT monitors in it" attitude that bothers me, as if a reason is not required.