I'd probably roll with Fire Emblem Awakening over the three listed, but as per usual it just depends on what you want in a game. Animal Crossing: A New Leaf will without a doubt kill your time like no other if you get into it. Luigi's Mansion: Dark Moon is very charming and good to play in short bursts and looks great in 3D, but doesn't have much staying power. Ocarina 3D is the best version of that game, but you've probably played various incarnations of it multiple times at this point. Fire Emblem offers a lot of gameplay, with a solid story(and lots of fun sidestories), and nice production values. Get them all at some point, but I think Fire Emblem tops the three here.