Ask HN: Medium, Tumblr vs Self-hosted?

I haven't blogged for a while and am thinking about taking it up again. Usually I would just put Wordpress on my webfaction account, but I was wondering if I am missing out with the Medium, Quora, Wordpress, Tumbler, etc. Has anyone noted any benefits of these for building an audience/driving traffic/content discovery? Or am I just as good set by running my own Wp?