According to Matt Cutts, the head of webspam at Google both platforms are good for blogging and both platforms are good for SEO. According to Matt, the Blogger is a simple blogging cloud based platform which requires no maintenance on your part as an owner of the blog. However the Blogger dos not provide as much flexibility as the WordPress platform which allows to install a variety of free plugins and widgets developed by the open source community. In terms of the Search Engine Optimization (SEO) both platforms are as well SEO friendly from Google Search Engine point of view.