Mimerss

Try to go with both of them. They're both really good stats, back in MoP I'd prioritize mastery due to being a big Reju user. Mastery increases how much your hots ticks for(if I'm not remembering wrong), aswell as how much your HT heals for.

Versatility currently is our worst stat.

Is the new DMF trinket for healers worth it or not? - Currently it's not been buffed as far as I know as the other trinkets seem to have been, and it'd only gain me 11 int, and 300 spirit instead of a 1k haste or 1k mastery use. I myself don't believe it to be better, though spirits always is usefull in the start of a new expac. - thoughts?