Ares is weird, really Ares isn't that great normally and his powerset he should just flat out lose to Kratos. A slow not too strong brick with no real durability and regen that doesn't matter.
But he also can fight Herc who irc has much better strength feats then Kratos, and actually gain the upperhand. As well as tank godkilling weapons and casually beatdown hypersonic characters. It really depends on which series you take him from, sometimes he's basically a greek Thing and sometimes he's better than people like Thor.