Anders, no doubt. He's an "Abomination", but if he would be "just" a mage, if not stronger, than a simple non-mage guy, why people fear the mages?
I suppose, Varric will win here, because the people like better him, than Anders. But this isn't the "who is the nicer guy" race... so: I would curious to the reasons: why would Varric the stronger. I can imagine an ambush from a long distance (Bianca), and (poison/explosive) traps. But if we count with Justice, Anders can survive and attack him. Without Justice, he still a healer, if the first shot doesn't kill him, he would win.