This is the Mage Class Tree, that I made, from a section of the Hero Guide over at the community discord. Decided to post the image here, for those who don’t have discord and just want to know the Mage information.
This is my opinion:
At this moment, in order of strength for Arena.
Arcane Blast/Arcane Twister/Arcane Barrage: Blast has a slight edge in targeting, but the others in concentrating damage.
Arcane Power: I don’t see any use in its current stage.