Stake takes out everything that is fun about the casino and puts it out in the open. Think of the place like a park where you can easily meet new people while still having fun with the likes of slots and blackjack.
The gambling site designed by the team behind Primedice puts the emphasis more on the social aspect of the site. You can change your personal avatar as well as the background of your profile. You can also earn social levels by completing certain challenges. This lets you unlock more avatar skins and achievements to show off to other people.