On reddit mention of the Epic Game Store brings out rabid haters. I know it's not as fully featured as Steam, has made some questionable moves (refund policies, sales without informing devs), and has quite a large stake owned by Tencent.
But then I hear that devs are getting cash up front and a bigger cut (I think it's like 85% compared to Steam's 70%) of profits. I'm happy that a developer may not need to crunch, or at least possibly not worry that if the game doesn't sell they'll be bankrupted.
I'd really like GOG to get a little better about this considering how great Galaxy 2.0 is and their general "No DRM" policy. It would become my default but Steam is still king for now