The mini-flight ability could actually be quite useful given the game’s map design and verticality. Even if it is only 10 feet (we don’t know if that will hold true, as Larian changed the range of many spells and abilities), it could be fun to bounce around the map every time you cast a spell.
The Draconic seems to be better on paper. A bit more damage, a bit extra hit points, and unarmored AC bonus (not relevant if you are human, half-elf, or multiclassed to wear armor).
I think I am going to go with storm simply because I have always gone Draconic in both EA and tabletop.
