Disc vs holy m+ essences

Hey I recently boosted this ally priest. I play all healers this expac. I decided to gear/essence grind priest next. (Did pally and druid) what essence should I aim for and when should I go disc? I feel holy bit better for my ilvl and I put only. I plan to do 15+ like my other toons.

For disc i like well for the major for those 350k instant heals. Then ert for mana and int. Then crucible for added dps

Holy im not sure what i would go. possible ert major with well and mana essence

Probably easiest just to look at the spec leaderboards on RIO.
https://raider.io/mythic-plus-spec-rankings/season-bfa-3/world/priest/holy
https://raider.io/mythic-plus-spec-rankings/season-bfa-3/world/priest/discipline

Issue with high ii is that essence rely on good team mates. As a pugingy rarely the case for me. So I need a stable direction till I am better.

Holy is pretty straightforward. Ever rising tide major with life binder and well minor.

You can make additional changes based on your needs, but that is pretty default for holy.