Best mobbing class?

But if you're looking for something that won't get balanced in the future, I'd go with arans.

You are aware that Aran's got nerfed to only hit 8 mobs, right? In terms of mobbing though, yes, they are still probably the best mobbers since all of their attacks hit multiple targets (to my knowledge). Their latest rebalance in Restructuing makes them very worthwhile with an instant combo attack (+150 combo at the cost of some health I think) and an overall damage buff.