Yes ArtStation is awesome, I just miss my random button :( I loved the random button on Cghub, hope it'll also appear on the ArtStation website at some point.
Artstation all the way. They kinda just popped up right as CGHub died so they're constantly implementing new features. Every update has been good though. Also: The devs behind Artstation have done some other good work (Drawcrowd). http://www.ballistiq.com/
I absolutely LOVE Artstation. That is where it's at now. Awesome art, awesome categorization. I'm just hoping for a better search tool. Right now it's kind of eh, but I am confident that they will be sorting that out soon.