Recently i got in a debate with a couple people after failing 15 times on 10 man blood queen, this is after a putri one shot. They were wondering why i hadn't taken serendipity as part of my holy spec that use for only two fights currently in icc, rather i had taken improved power word shield.
During the blood queen i was supposed to heal one group (Ranged), and my cycle was pom,coh, renew renew renew renew renew. and using pws to support people that got the "brain link"
now the second party was saying i should use poh vs the renews
Now i tried to explain my type of healing style in this situation and it didn't get into their thick heads.
here are the raw numbers comparing these two styles
now these numbers are not effected by raid buffs
Coh + Renews Flash x3 + Poh (with serendipity)
Mana cost: 3280 Mana Cost: 4958
Total healing: ~50080 Total healing: ~42100
Set up time: ~6 sec Set up time: ~7 sec
Now by my numbers it seems alot better to stick with renew, if there is something i'm missing about not using the renew strat i would love if a holy priest could enlighten me, Thanks