As I will mostly play MM (all content except Mythic raiding), I'll go Venthyr. I like Flayed Shot and the flow it brings to our rotation. I also like Kyrian, their aesthetics are awesome, but I think we have already good AoE and Resonating Arrow is really easy to dodge in PvP. Plus the Venthyr signature teleport will be game breaking, even out of combat.
So, what covenant will you choose?