Again, perfectly legit for you to prefer the one over the other, but saying that Martin's series doesn't have "the system/backstory/details Wot has," and that it has a more "vast" and "lively" world, those to me just seem like a crazy things to say. There's all sorts of backstory, world-building, and ridiculous numbers of characters in ASOIAF. I mean, for one it so far has well over a thousand named characters (
link). And there's all kinds of interesting backstory about the Targaryen conquest of Westeros, the history of the various religions, the rebellion, the history of the Night's Watch, history of the First Men, old conflicts and alliances between the great families, all that stuff. After reading nine books of WoT, I found Martin's books more fleshed out in terms of both the characters and the world.
I guess we just have to agree to disagree.