IPhone 5, iPhone 4S, or iPhone 4?

Which one is best (cost doesn't matter)? Personal opinions welcome.Id be having a contract with AT&T. And should I get black or white?

IPhone 5 black

Black and my grandpa who owns a computer store, loves the 5

Isn't it obvious? The 5.

The colour is entirely up to personal preference

Latest version is obviously best.

Definitely the iphone 5. I would get the white one because it has a classy style to it. Hope i help.