WordPress or Blogger, which should I choose?

I am planning to start a new blog but I am stuck on deciding whether to use wordpress or blogger. I am fairly experienced with wordpress but Blogger has one big advantage…Hosting!

I was wondering if it is liable to use blogger for a serious blog. Are there any disadvantaged with using blogger? I thought themes would be a problem but I found some really good themes that rival top wordpress themes. I want to know if there is any particular reason why persons stay away from blogger.