www really doesn't matter and has nothing to do with the quality of a website. It used to be that servers would use the www subdomain so that they could be told apart from their mailservers (which would use smtp) and other servers they might have.

Nowadays this isn't really needed. Most websites can be accessed with and without the www. The www is usually just used out of tradition and because it makes a domain look more like a web address for the masses.