I guess you mean trials too?

Top 3:
Bismarck HM/EX- Reminds me of Jhen Mohran, loved playing Monster Hunter so I loved this, same goes for Steps of Faith.
Leviathan HM/EX - Just love the boss design, the music, being surrounded by the seas.
Ravana HM/EX - The music! Do I need to say anymore?

Worst 3:
Garuda NM/HM/EX - Incredibly boring, boring boss design, boring area design, boring music...
The Chrysalis - I dread getting this in Duty Roulette, too easy while also being too long.
Cape Westwind - I don't even know why this is a trial.