Wallscroll or Poster?

I was checking out some wallscrolls and posters online.
My first question is what is difference between a wallscroll and a poster and which one should I get?

A poster is the usual, made of paper-like material... usually they're small if you're buying the Japanese variety, I'd give you a guesstimate but I'm no good at that. Wall-scrolls are made from cloth, and are larger than a normal American poster.

It's all a matter of preference and how much size you have on your wall, really. I like both.