Majora's Mask 3D. Even to this day continues to be the very best game in the Legend of Zelda series, it's so different than the rest of them and does not follow the typical convention of: Zelda gets kidnapped, and Ganon is the bad guy wich at this point is dull, boring and predictable. For ignoring that the game shines form it's own merits of having a much deep storyline, multiple playable characters, an interesting villain, npc with personality and a good world designed overall with it's fresh time based ideas.
Majora's Mask 3D keeps the overall experience of the original with some major improvements, permanent save files made the journey more comfortable, the song of double time now let's you skip forward to any hour of every day, so the dull waiting for specific time events are over.
All bosses have been slightly altered in some way but for the better in order to use Lnik altered forms more, special mention to Gyorg and Twinmold boss fight, the first for being challenging without being tedious and the later for actually requiring strategy to defeat it instead of mindlessly swinging your sword.
Sadly not all changes were for the better and there were several missed opportunities, Zora Link swiming is worse, now his standar swimming is simmilar to N64 Mario swimming, not as slow but nowhere near as fast or fun as in the original version, it still can be done by pressing down the R trigger, the problem: it runs on magic so if it's gone the only thing you get it's a small boost.
Also this game while is not just a simple port as Ocarina 3DS was it isn't a fully fleshed out remake, yeah it's improved in sound, graphics and interface but at it's core it still the same game, no new dungeons or some sort of hero mode may disappoint you specially since nintendo did add extra dungeons to some titles of the series that saw a port on other console (Awakening DX, Link To The Past GBA).
Still the game holds up and is a great way to experience it for the first time and I won't lie that revisiting the game in this improved version was fun and satisfying, Nintendo should take Majora's Mask as a template for the series: don't relay always in the same convention, by doing things different within the same series you'll get an incredible game that manages to stand out from the rest.
In other words, 3D Zelda.