Angels vs demons recs?

I’m looking for recommendations for books/series that centre around a conflict between angels and demons.

It can be Judeo-Christian angels and demons or it can be a totally original take on the concept but as long as there are demon/demon-like races fighting angel/angel-like races, that’s what I’m looking for.

Bonus points if at least some of the fighting actually happens in heaven or hell and not just on earth. Also bonus if the line between demons = bad, angels = good blurs somewhat. Maybe some not-so-evil demons and vice versa.