both are good, but just be patient with blogger, if you haven't notice, take a look at the biggest sites, alexa.com, twitter.com, google, all their blogs are serviced by blogger, and their pr is around 6 and 7. So it's not really who's better, it's about patience in working your blog, I had an experiment before with a blogger, I did a linkbuilding project on it too early, and google just sandboxed it after a week. So keep building your site, google will give you a reward for it.