GOG. DRM-free support needs all the help it can get. I have nothing but respect for Steam, so it’s my secondary choice. The only exception is if it’s a game that’s been out for a while and there’s been discrepancies between GOG and Steam support (or a dev/publisher with a history of said issues), in which case I’ll go with the one that’s better supported.
I picked them up a few months ago so I could watch Clerks 3 and Ghostbusters Afterlife. Then I ended up watching Spartacus, Ash vs Evil Dead, and Outlander. There’s a few other things on there I’d like to see, but I don’t think it’s enough to justify a yearly subscription considering how little TV I watch. Once they have John Wick 4 and I get through that, then I’ll probably cancel.