Now, while i'm not going to specifically review all the episodes, i actually am just going to order them from favorite to least favorite.
1. To The Bitter End
2. Don't Steal My Birthday!
3. The Portrait
4. Own the Sky
5. A Fork in the Friendship
6. The Runaway
7. The Golden Egg
8. Rock On!
9. Bad Princess
10. The Prankster
11. Pig Power
12. All That Glitters
13. Rock On!
14. All Stella Season 2 Episodes
Now, I'm just giving you the episodes that are chronological and nessecary to the plot.
1. A Fork in the Friendship
2. Bad Princess
3. The Golden Egg
6. All that Glitters
12. Don't Steal My Birthday!
13. To the Bitter End
Now, i'm not saying that the other episodes aren't good, it's just that I noticed there's random episodes and that's okay. Otherwise, if you're marathoning the series then just watch those episodes if you need to save time.
And lastly, I don't really like Stella Season 2. It doesn't seem as purposeful as Season 1. That's probably because Rovio doesn't want to work on it anymore, which is a shame, because Stella (a lot of people will disagree on me with this one) is the best game, or at least cartoon series, by far.