A Link Between Worlds. I haven't beaten either yet, but it's been such a long time since I've played a new Zelda game that actually felt incredible beginning to end. The enemies hit hard, the puzzles are incredible, and there's free roaming the world and dungeons.
This is like choosing between my left hand and my right hand. Sure, I'm right handed, but I can't play games other than Wii Bowling without my left hand too. I'm not going to vote until I've finished playing both games, and I'll likely have to give LBW the edge, but both games are great. LBW though, man, has got to be the best Zelda ever originally designed for a handheld.
@Zero It's going how I expected. People may be enjoying 3D World, but it's a pretty formulaic Mario game, and based around one from two years ago. The new Zelda, on the other hand, is something we haven't seen for a very long time. I'm not surprised people would choose it as the "better" game even if they immensely enjoyed 3D World.
@anon_mastermind Hmm, that could be true as well... I have both but haven't started Zelda yet. Mind you, it's not because Mario is in the way as I always find time for both consoles and handhelds, but Phoenix Wright is still yet to be finished...