As a non-designer I like the use of Behance because I am able to upload any image size I believe — On Dribbble it has to be a certain image size so sometimes my design (I suck at it) gets cut off.
What I like about both websites is that you are able to embed a no follow link in the description.
Google does pick up the “link” in their Google Search Console and the domains in general have strong authority.
Both of these websites are good to use to build out images for SEO purposes, link building, or as a branding tactic.
These tactics along with general digital marketing strategy will help any business gain more traction and visibility online!