What is best:

a 16:9 screen (1.85:1) or a 2.35:1 screen?

Also:

is a greay screen better to use than a white screen? Why?

Best for what? What do you watch?

Well I watch a lot of movies. Play video games and watch football games. So I guess a 16:9 screen. Someone though explain the diffrence between using a white or gray screen please. Thank you.