We have already covered post on Difference between free and Self hosted wordpress blog 
and when it comes to BlogSpot, it is almost equal to free WordPress blog. Where it has it’s own advantage and disadvantages. Few days back Google stopped FTP blogger publishing and finally in May they are going to remove the support for the same.
FTP BlogSpot bloggers have choice to migrate to normal BlogSpot blog or Self hosted WordPress blog. While migration few things which really matters are, Permalink, Search engine traffic and ranking, Subscriber migration.
Blogger to WordPress migration service is a professional Web services which will help you migrate your blog to WordPress without losing anything. This service is started by rtCamp which is a WordPress development company. They have already transferred lots of BlogSpot blog successfully and you can see a list of wordpress migrated blog here.
