I always prefer flavor. Particularly if it has cadence.
This is Avon, who has sworn his name to the Vortex for Power, Summoner of Spirits, Walker through Realms Unseen, mighty Wizard!
...
...
His friends call him Av.
One of the things that drew me to the game is actually the Flavor of a lot of their move names and descriptions. Remember that humans lost their Summoning racial and some spells were re-worded in the last iteration. I wouldn't mind seeing instead something like 'master of Lightning' and a demo of how he flavors his Magic Missile and such to be lightning themed (which surprises me that not everyone does in the games I've demoed, so it's a cool thing to throw in).
But they have wordcount, and such to consider.