>>46042269B2W2 is my favorite game, but I have to admit that Unova is pretty linear. It's a fucking circle for God's sake. I love Johto and Hoenn more since it gives you more freedom to run around and get lost.
You can argue that you don't go through the story in a circle in B2W2, but you're actually being railroaded. In BW, it's pretty straightforward.