Originally Posted by
Redsparowe
Using that spreadsheet with my current gear and looking through logs to see my usual spell breakdown and using a roughly artificial value for spirit I'm using this;
Int 1
Spellpower 0.9
Spirit 0.9
Multistrike 0.55
Haste 0.5
Mastery 0.4
Crit 0.45
Versatility 0.4
hopefully it's quite obvious that healing stat weights are variable based on what buttons you're pressing so I'm simply using these as a guideline only when determining gear upgrades.
for your belt situation this would mean;
320.65 for the heroic
324.7 for the mythic
These are incredibly close, my stat weights have mastery ranked quite low since a large part of my healing comes from renew. If you find yourself using direct healing spells more often then it might push the heroic belt ahead. In either case you can be quite sure that the difference is minuscule and you won't be holding yourself back either way. If you haven't already gemmed the belt (or if it's still BoE) then I'd probably just pick based on saving myself gold.