Users will be able to find it, because if your blog is on a different domain, it will probably be somewhere on the first page of google results when you search

Users will be able to find it, because if your blog is on a different domain, it will probably be somewhere on the first page of google results when you search for your company. I would just keep the blog somewhere like wordpress because they will have a more fully functional blogging engine. Don't spend your time managing your blog software, spend it making your product better.