Sorry it took me so long to respond, I had to actually think about this. I'm assuming you mean fic authors and in that case, it's actually very hard. I have a very small list of fav authors in which they are a favourite because I will read all their fics regardless of ship/content unless that content is something I cannot physically read.

First up is rchimedes; the AUs they create, and the way they write is absolutely amazing, and honestly, I strive to be as amazing a writer as they are one day.
Then we have ChaoticQuill; I adore Quill's works, and often reread my favourite works (especially SMOD because I am trash for that fic)
There's also Saaphirx, who's writing I eat up so fast whenever it comes around because they have good ideas.
I can't forget featherx either, and I'm sure you all know what fic I mean when I say that; they are a big inspiration behind the way I write Poe
And that's it for BSD authors really, although there are many others who I enjoy one or two work of!!

In other fandoms, there's DrAphra for MHA, who also has such amazing AUs and an enjoyable writing style, and even though I'm not in the fandom much anymore, I still look out for their works. Haikyuu, we have RussianSunflower3, valiantarmor

And yeah, that's about it honestly, off the top of my head at least. Hope that answers your question!