I have wanted very much to love Keep It but always found it extremely buggy and I was fed up with it, so now I use Bear like you do, but also keep archived stuff in there. One less app to worry about.
I use Drafts too but it’s only an inbox / temporary storage place, that way I am sure to keep my notes system clean and ordered. I use tagging to quickly find transient notes (the equivalent of post-it notes you trash once you have dealt with them) and anything more important is appropriately stored into Bear. (I talked about my own system and the way Drafts works like the second-tier of an inbox here: KillerWhale’s system for organising knowledge and creativity (not PARA) (LONG)
I was a diehard fan of Scrivener but the recent dismissive attitude of support regarding sync bug has really challenged my trust of the app. I have begun a slow move to Ulysses to see if it can support the complexity of my writing projects.