Originally Posted by
thrizie
Not completely true, the questions you need to ask are "Do I really need the extra spellpower" and "Does Renewal allow me last until I can safely plea?"
Take Beasts 25 heroic for an example, pleaing during gormok can be fatal for a tank. Given the amount of holy lights you're going to be casting in that phase, renewal will save you massive amounts of mana, allowing you to last until the worms transition before needing to plea.
It's not always about what you finish a fight on, it's about having anough mana to get through the heavy healing phases. Obviously if we're talking pure HPM, renewal is vastly superior to all the other librams.