You're taking the comparison a tad too literally. They were both dominant by relying on being exceptionally skilled with a limited tool set that their opponents had no clue how to stop. I definitely agree that Gracie's accomplishments were far more impressive and he will have the better legacy. In Ronda's defense though I will say that her opponents at least were familiar with all of the prominent disciplines in MMA. Some of the guys Gracie was subbing had never even heard of ju-jitsu.