Crit Rate or Total Damage?

The 3% total damage isn't a straight 1.03 multiplier because he is getting %dmg buffs from other areas as well e.g. ancient warding

Even so, without doing calcs, based on similar questions I asked months ago, %dmg will be better. If it isn't, the difference is negligible and not worth the money.

can't talk about that, because nexon decided some buffs stack like that and others don't, but from my experience with DrK's, zerk's 1.6x is multiplicative with %damage and boss. and have been unable to test mercedes'

but in this case, this is the difference between full crits every time, and not hitting full crits :X which imo, makes the crits better.