When I first started writing a blog, I started on WordPress. Of course, since I'm a commercial artist (I do my art for money) and wanted to get the benefits of Google for optimization, I moved it to Blogger after a couple of weeks. No harm was really done, as the pages hadn't been indexed for a Google search, and really, no one had found the blog yet. What was annoying is that I didn't realize that all of the images, which were uploaded to a particular server, disappeared when I moved it.
So, stay where you are!