Although Steam is currently the leader when it comes to PC gaming in terms digital distribution, what is the next best thing?

From my experience in the PC Department, here is how I rank them:

1. Good Old Games
2. Blizzard Battle.net
3. EA's Origin
4. Ubisoft Uplay
5. Epic Game's Launcher

Now, I would like to know what is yours from the above listed platforms who offer a similar service like Valve's Steam. Who ranks second in terms of service, features and what not?

Fee free state it in the comments section. Peace out.