Originally Posted by
Mazi
If you're using 7-8 healers for fights then Haste is going to benefit you more for the reasons you already mentioned. If you are using less healers such as 5-6 then Mastery is going to benefit your raid more as it will stabilize people faster.
Honestly you can't really go wrong either way, both methods of healing are solid all the way from Halfus to Sinestra. I've played both Haste stacked and Mastery stacked and don't really see a difference in either.
Other things that can help you get to your targets faster are your keybinds and methods of targeting. Are you clicking a person and then hitting your heal button or using mouseovers/Clique? If you use Clique/mouseovers then you are going to increase your healing by a lot as that half a second you aren't spending clicking and then waiting to hit your button really add up over time, even more-so than Haste sometimes.
When I was Haste stacking I was at about 23% Haste raid buffed, when I had to swap to Mastery (to play Disc on some fights) I went from a 2.2 sec PoH to a 2.1 sec PoH and saw no decrease in my healing done by PoH, rather a pure increase on Echo of Light. That .1 second is what you, and your raid, make of it. Currently I'm sitting at 7.18% Haste / 17.96 Mastery unbuffed.