For the most of us who blog frequently, we already familiar with either one of the blog platform, Blogger, WordPress, WordPress on domain, and Typepad. The question of which blog platform is the best had been discussed many times and at many place. I had found an interesting article on which blog platform is best for SEO.
Dave opened accounts at the three major hosted blog platforms (WordPress, Typepad & Blogger), and wrote two equivalent posts (similar titles and keyword densities) on each platform using made-up keywords. He then monitored the search results for these fictitious keywords to see how quickly the posts would be indexed and how the posts would rank relative to each other.
WordPress. While the assessment is more qualitative than quantitative, WordPress rank high in term of time of indexing and relative ranking at major search engine like Google, Google Blog Search and Yahoo.
WordPress that hosted on your own domain will gain search performance to be similar (maybe even better) to a WordPress blog hosted on wordpress.com.
For the rest of the article you can read it here.