I do not believe such a thing could be answered without bias, perhaps... I prefer the discipline sort myself, but it is what I was raised on. Spells to produce certain effects with certain potions and invocations... It is more formulaic. It makes more sense to me.

[And even though her magic spells had been only science in the end, she'd been raised considering them magic, which made ritual forms of magic easier for her to grasp by far than the more instant driven sorts.]

If it were a battle though, against another magic user... The undisciplined style may have the advantage...