Mine would probably still be Drydock Scratch aka Retrospective Runaround. I just love these huge caverns. It makes me feel like I'm an explorer uncovering a lost civilization.
Abbadon's Ascent in Sirens Landing. It's decently long with well-placed checkpoints. The jumps feel fair and make sense, i.e. they almost all look like the logical next step up the spire.
It sometimes pops in the dailies; and if there's also Ascalon vista, you can just carefully get down from the puzzles finish line to get that objective done
Retrospective is great. It is good you can skip the skritt tunnels near the end these days. Was my only critique.
Very clever to go through the whole map. Wish we had something like this these days.
My favourite is the whole Super Adventure Box if that counts. ;)
Really liked the look at world 3 and i hope they keep adding more next year.
I think the whole game has very nice jumping puzzles tho. Even the hard ones are doable if you cheat with TaCo markers.