That right there is the $64,000 question. Which is right and which is wrong? The answer is both for both. My personal thought is that extremes are bad. They shoe horn you and cripple you in as many ways as they may seem to help you. I personally don't believe that either extreme by themselves is the right answer, no matter how much people debate the topic or express their opinion on it. There is however only one right answer, and well, it is simply whatever lets you get the job done. In an average raid week, it is not uncommon for me to spend time reforging, re-gemming and shuffling things around to best suit the fight. Some fights will require some more spirit, others I'll buy wow accounts stack some more mastery and take advantage of some Deep Healing. Some nights I will change my load out depending on what the healing team looks like for a night in order to better compliment the team.
As far as I'm concerned, at the end of the day it's about getting the job done however you need to get it done working with your team. Your stats may shift, you may change fight to fight, but you just need to be ready to do that. Do not become swayed by either extreme. If you find yourself hurting for mana even though you are rolling MTT on cooldown, stack some more spirit. After all you can't heal if you have no mana. If you find yourself with a mana bar that isn't moving and your heals are hitting like limp pasta, drop wow gold some spirit and look at some of your other stats. Find your balance, what works for you in your situations. Don't heal in a world of pure black and white, and swim in that gray area. As far as I'm concerned, that is the right answer. What do you think?