From a user standpoint, steemit. The reasons for this start with it's use... An online journal. Branching off from there to social interaction.. and you have a complete system that includes the ability to move money around easily. The ability to write what's on my mind, and tip a friend a few bucks because they need it, on the same system, works for me. A singular place online to store and maintain a digital life. And this is just from a users perspective.

Enter the developer, with JavaScript and python libraries, development of steem powered apps couldn't be easier. There is the heavy vs light client debate with blockchain based solution being a light client and offloading the heavy work to blockchain nodes or the heavy client having everything built in to run the platform (self hosted WordPress? LAMP stack? Etc..)... And without a clear distinction between a "winner".. steem is it for now from a price perspective, as you can setup a static site with less resources for free somewhere online and use steemit for the database. Not many other blockchains let you do this for free (or close enough to free to matter). Oh, and the community, its amazing too!! ^>^