so lets say I can choose between having 90 spirit, or have 90 crit rating.
My opinion about this is:
PoH specc = Crit > spirit
Why? If you specc PoH you will want to have atleast 2, ideally 3 stacks of serendipity when you cast a PoH. Crit will give you more Serendipity speccs, and bigger hots of your PoH's
Renew specc = Spirit > Crit
Crit is basically worthless when you spam renew, it will give you bigger heals on POM/Circle of healing, but in the current damaging mechanism you will probably overheal with CoH anyway, assuming you have Test of Faith specced in renew specc.
Spirit will give you sp, meaning your hots will have bigger heals, meaning you can get rid of the renew glyph at some point, making blanketing more effective.
What is your opinion about this?