Welcome to the Q&A Forum

What's your goal when it comes to blogging? Are you trying to gain backlinks? Or Are you trying to drive more leads? I think it largely depends on what your goals are for blogging. If you're hoping to build backlinks and rank well I'd self publish on my own website.  But then I'd leverage Medium and LinkedIn as a means of content distribution. However, since you mentioned rankings and backlinks I'd publish on my own site. I would target content themes/keywords that aren't super competitive and maintain a consistent publishing schedule. I would also spend a healthy amount of time promoting that content as well. Also, I'd recommend setting up a subfolder for your blog rather than a subdomain. But before making any decision I'd take a step back and just think through my goals first. Best of luck!

From 40-50 characters are enough getting a look in search engine, you must have already few info about ranking as I know. I found one simple look site that is: http://amazeinvent.com/ having not what you think.