It's 20%. Inner Beast is 20%, Vengeance is 30%, but the cooldown is much longer.
Is a completely worthless number, because incoming damage is not an average, it is spikey.
WAR will be able to reduce all spikes by less, where PLD will be able to reduce almost all the spikes by more and the spikes they can't reduce they will have Convalescence for anyways.
PLD cooldowns are strictly better, but the WAR cooldowns are good enough.
