Well, Worlds, like on RuneScape, were a player can go in between them at any given time, or Set realms, that the realm you choose to create your character for, is the realm you will always play, I prefer worlds, Vote away. =)
Yeah I like worlds being confined in the same realm is is annoying or maybe like a combination like realms but you could change like all the realms/worlds were different but you could change anytime you wanted to.

