Well for now, yes, the Steam updater is easier to work with so updates are coming at a really nice pace. Then again, GoG Galaxy is in Beta and it will work similar to Steam if I'm not mistaken so you should be able to get updates on time when it gets released.
So just a little more patience and I think GoG will do it's part too. :)
Whenever SPG2 gets updated on Steam, I post patch notes here so people can get a heads up what's coming. And GoG moderators usually post the same thing after they update here. :)
Anyway, I'm here as a SPG2 community member who's been playing this since first day of Early Access on Steam (more than a year ago), so don't hesitate to ask if you have any questions about the game or need any help.
If I don't know the answer, someone on Steam probably does so I can copy paste it, and if it's a technical problem I can contact devs and find out.
Fly safe, Captain! :)