burst healing of a significant value is more valuable (by leagues) in raiding over small values that come up more often. I will tell you right now---the 400 potency heal of soul eater will mean nothing in raiding--when a buster hits you for nearly all of your health, and the next auto attack may kill you the 400 potency heal (which you need to be ready to land right in that window) isnt going to save you.

Smaller heals (blood bath, IB, soul eater) mostly get over written by healers--healers are not going to take into account your paltry self heal when they line up what to land on you.

Inner Beast is shadow skin whenever you want---thats why its great.
Thrill of Battle/equilibrium can make up for bad luck in a fight, either by pushing your health instantly over what might kill you (or recovering before the next mechanic/attack will kill you).
Periodic healing (which is what soul eater, blood bath are) are largely irrelevant outside of dungeons.