I haven't seen volume 2 yet so I am gonna mention my favorite episodes from volume 1:
A new Beginning
Sword and Staff
Crack in the World
The galactic Guardians
Escape from Gaolotia
This is tough since I really like must of the episodes but these are the ones that I like the most.
I also like the saga were He-man is on the run. But I forgot the names of the episodes.