At the end of the day, that’s all about contents, instead of platforms. So you can choose which blogging platform works for you. Blogspot, WordPress, Tumblr, Posterous — name it. Just blog, which is good for you. Trust me :-D
WordPress just announced that they have created a “Posterous Importer” for hosted customers. Similar to their other importer tools, this new one takes the content on a Posterous blog and imports it into a wordpress.com hosted blog. The Posterous importer can import posts, tags, comments, and image attachments.