I liked the layout of the world in Dark Souls 1 more, the way everything was interconnected with a bunch of different paths--the world felt very dense. In Dark Souls 2, I think some areas look great, in terms of art and architecture, but the overall layout of the world is different: it felt more like a central hub, Majula, with a bunch of paths branching of in different directions, sometimes interconnecting, but more often not. In terms of the overall game, I like them both quite a bit. I think they improved a lot in terms of UI and game mechanics in DS2, but they are both fantastic games. Still haven't played the DLC for 2, which from the little bit I've seen, seems to add quite a bit to the game.