Xpac after xpac, Resto Druid almost always tops M+ or at least ranks highly in the healer tiers. Disc can be solid or average, but almost always gets beat out by Resto Druid. And Holy Priest is often average, worse or the very worst.
Perhaps it is premature at this stage to guess how healers are going to rank, but currently Resto Druid is again at the top. And Holy Priest is perhaps looking average.
For starters, give priest healers, even ALL healers a Brez, please. Brez is incredibly powerful. Second, give priests something to compensate for lower HPS and keep up with Resto Druid with all of its, quite frankly, OP heals. I’ve heard Resto not only has amazing HPS, but NO mana issues.
Just saying.