For me its Paradise Lost's An Eternity Of Lies. It has everything, choral interludes, doom laden riffs and the best non clean singing Nick has done (in my opinion).
That's because they're not... They don't have an ounce of hardcore in their sound. No doubt they've become a lot more commercial since they started playing the "blackened"/symphonic death metal they became popular for, but "metalcore" here seems a lot more like a blanket pejorative than anything specific to do with their music.
I prefer the more extreme styles, particularly Death, Blackened Death, Black and Gothic but I have an AC/DC playlist too bands I like include Cannibal Corpse, Watain, Electric Wizard, Paradise Lost, Behemoth, Rotting Christ, Carach Angren, Slayer and many many more but those get particularly heavy rotation on Spotify.
Thank you!