Rapiers have a great hidden back/rip damage boost in addition to the listed crit boost. Best in the game. Rapier is at the top, other rapiers are slightly lower. The bandit knife does great back/rip damage too but slightly less then the rapiers. The hornet ring adds MASSIVE damage. Rapier/Estoc are really good.
Critical damage appears to ignore (or greatly reduce) the target's defense. A typical weapon can do either 2 or 3 times it's attack rating in critical damage. Most daggers do more than 4 times their attack rating in critical damage. The Umbral Dagger has the highest critical modifier in the game, at least for backstabs.
For Dark Souls on the PlayStation 3, a GameFAQs message board topic titled "What's considered the best backstab weapon now that the dlc is out?" - Page 2. Menu.
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dark souls 3 best backstab weapon