I use DeviantArt and Artstaion, but I put different things on them. My Artstation is more for my 3D work and 2D with high quality (for 3D I use Sketchfab too). DeviantArt is my playground, I put everything I do there, as well tutorials, brushes for MangaStudio, old cosplay photos.
A time ago I readed that, in the case of showing your work, the more the best. The problem is to update so many places, sometimes take a lot of time to do it :/