Whas thinking a little and im a shadow priest, i'm not a JC. Means i need to put 2x 9spell power & 8spirit gems in 2 gem slots to get the meta gem that gives 21 crit rating & 3% crit dmg.
Or i can go for the Meta that gives 25 spell power & 2% intellect and then i dont need the 9 spell power gems and can put 19 instead.
So i would come to this 25 + 18 = 43 spell power (18 is from 2x 9 spell power gems) & 2% intellect VS 21 crit rating & 3% crit dmg..
I dunno what to take tbh in 3.1 all my spells/dots can crit so best would be to go for the crit rating one but that 3%crit dmg does it really > 43 spell power?
any1 that done some testing/math on this that can help?