I would say that if you're running a startup as a solo founder, don't bother wasting time and mental capacity on hosting your own blog - just use Tumblr or Wordpress.com. Unless you're in the blog platform business, it's really a no brainer (at least until you grow and have too much money and/or turn into a control freak).

But bravo OP for having the courage to launch your own business! Good luck.