I prefer Galaxy. I think "3D" worked REALLY well in the context of a 3DS game; Land is a perfect game that you can just pick up and play a couple levels for a few minutes in between something while you're on the go, and it shows off the capabilities of the 3DS perfectly. But after playing 3D World I feel like I can definitely say that Galaxy is just a superior series when judged head-to-head with the 3D games.