I've posted here before, but as of now it's the Stone Tower Temple. decent enough dungeon, but I don't like how it's more straight-forward than the Great Bay and Snowhead Temples. Each individual room is okay though, which is why I like it more than Snowhead Temple. The Elegy of Emptiness gets...
Literally the most recent dungeon I beat was Jabu Jabu's Belly in Ocarina of Time 3D a few hours ago. Not really my favorite, but I like the creative atmosphere.
The most recent new dungeon I beat I think was either the Ancient Tomb from Oracle of Ages, or the Sky Keep from Skyward Sword...