I'm personally going Zelda. Although if I didn't have many other reasons stacking up for it, I would probably choose Super Mario 3D World.
Given I want to get Zelda digitally on my 3DS, I figure I will buy it that day. Every year my mother wants to know something she can get me for Christmas. So I figure I will tell her Mario 3d World. This way I can keep my zelda game digital on the 3ds, and have any easy answer for my mother when that time comes.
Nothing like being almost 30 and still telling your mom a game you want for Christmas. :P