Elfeed on Emacs, on Linux and Windows. I tried several RSS readers for years, then, being an Emacs user myself, I gave Elfeed a go and never looked back. One key binding to open full articles in Emacs EWW (for those feeds providing only previews), and one to play media with mpv and yt-dlp. Best solution ever (for me) to get daily disenshittified web contents.

On mobile, there is nothing I like, I consider Feeder on Android the least bad.