My Season 4 favorites:
1. Praimfaya 4x13 - Epic Season finale
2. We will rise 4x06 - Seeing Bellamy and Roan working together was amazing
3. The Chosen 4x12 - Loved the Raven rescue mission and when Echo appears to save their lives
4. The Other Side 4x11 - Bellamy and Abby risked everything to save Octavia, Kane and 1200 people
5. Gimme Shelter 4x07 - Love the Bellamy/Kane and the Octavia/Ilian moments
I also think that Die All, Die Merrily 4x10 is one of the best all time episodes, but it's not on my list because we have lost 3 characters which I really loved in this episode.