This discussion has been had SO many times over the years. Knight tanking is driven by the ability to self heal. This healing is fixed. SK from lifetaps and lifeleech and Paladins from heals. The easier the content, the more impactful the fixed healing is. For example, making up numbers, but if a knight self heals 100k/second, it will be near invincible on fights where the damage sustained is less than 100k. As incoming damage is increased, the knight benefit decreases. In group content where damage sustained is very low, raid geared knights require little healing unless a huge group is pulled. Warrior tanking is driven by mitigation. Unlike knight disciplines that have a cap, warrior disciplines such as Last Stand will run the full duration even against raid bosses. Basically, the warrior mitigates a higher percentage of damage. So in low damage situations, such as group content, this is less beneficial than the fixed amount of self healing from knights. The better geared the tanks and easier the content, the more pronounced the difference. So let’s talk about raid content. When content wrecks you (such as tanking AoW), knight self healing only offsets a small percentage of the incoming damage. It also doesn’t prevent against spikes. Warriors on the other hand benefit from higher mitigation, the benefit of which scales infinitely with incoming damage. THIS is why warriors are the tank of choice for raid bosses and potentially raid adds if the adds hit hard enough. So looking at ToV, which was generally regarded as an easy expansion, it is no surprise that warriors won’t perform as well as knights except when pulling a dozen NPCs or tanking the hardest raid bosses.