The difference in dmg probably would not be that big though, I'd wager about 5k difference tops, which is like 1/2 extra autoattacks between the two equips
I'd say the better question put here is which would be much more useful in battle then, since both specs have their disadvantages:
Ror's achilles is it reduces your critical rate by 30%,
Wild ring drops your elemental resistance by 10%.
My recommendation for the top-fastkill-solo class will still ultimately be Alchemists due to Damage disable sets and defense-ignoring Ailment damages. It's nigh-impossible for any other class to easily catch up, even with the introduction of Lv360 skills in the far-off future.