I have played 3.3 stuff for several weeks, and I'm pretty much enjoying it a lot, and I pretty much love all the content in the game. Though the top three content I love the most and why are:

Nidhogg- the theme is pretty epic, the mechanics are well executed in both normal and extreme, and pretty challenging, but still fun.

Weeping City of Mhach- the difficulty of the 24-man raid is well balanced, Ozma is in it, and I love his theme inside of him, which is why I want a Savage version!

Aquapolis- IT'S ALL ABOUT GIL!!! If we didn't get trolled by RNG, I would have bought a mansion already lol. But that's what I like about Aquapolis. Trolololololol.

I'm pretty sure Palace of the Dead will become my next favorite in 3.35, which is 6 days away.

Which content in 3.3 do you like the most?