Best mythic for an arcane rider?

[BlackJesus]

I think I am torn between azata and lich both seem pretty damn good.

[Tolfdir]

Do both. Lich alone can have at least 3 different flavors (playthroughs). I did one and plan to do more later.

[Conquista]

i think its trickster, but trickster is the best mythic path for alot of martial or gish builds

[HeLLfire]

Every path can work, and be fun.
Still, some combinations are just better from a mechanical point of view.
So, it depends on how much you want to min-max Vs your character idea and your chosen game difficulty.
That being said, i agree that trickster can easily be the strongest for that class with a focus on it's special improved crit lines and even a free wizard spell book later.