I pick either chef or musician (imo those and soldier are the only jobs worth picking) depending on if I want more offense and defense (chef) or longer debuffs (musician). Fights against singlular enemies are over in one turn without soldier anyways, and soldier does nothing turn two+ so once you can maintain the potion effects, with chef you just have a +50 to ALL stats, which helps a lot in multi-boss fights or imp gangs. Musician's kinda funny though, since you can pretty much permastun anything with witch seal (from equipping witch broom), and the upgraded flash and ice shard spells for -6 ap to anything. Even without extended spell effects, alternating between 2 targets with upgraded ice shard twice and flash gives -3 ap, which is what most enemies have, meaning they never get a turn. Extra duration makes the stun last longer, giving you some leeway to cast upgraded soothing waters to heal, restore mana, and potentially res your elemental (at least, I think it can res) if you need it.