If you're going to be facing other magic users, and there's quite the bunch here, then I'd stick with Spellbane. Lightning rounds combined with this can make a deadly combo of dispelling enemy magic and them shocking them with your own. That being said, One Question is more versatile. Lightning rounds combined with staggering explosions that can dispatch groups of enemies quick is another good option, and not only restricted to one type of enemy. Personally, I'd go with One Question. Even though I face the jinx-flinging likes of you, Mage, Deth, and others, some people use shields or temporary armour that can be shattered from explosions, and then possibly disabled from a lightning shock.