I have used blogger for a short while, tumblr for quite some time, wordpress.com and now on wordpress.org.
I have never been quite a fan of blogger (in fact hate it after they put in a mechanism to censor blogs with the introduction of country suffix to address). But would vouch for tumblr and wordpress.
Wordpress.com has only one disadvantage as far as I am concerned you will not be able to use many widgets or javascripts (but most of them do not add any value anyways). The widgets that are available with wordpress are more than sufficient.
With respect to writing a post, wordpress integrates with Zemanta and throws related posts and images which are pretty cool.
Commenting I have never had a problem commenting on wordpress sites or people commenting on mine. On the contrary more often than not, I run into issues commenting on blogger sites and it has happened to a few of my friends too.
Since you have only 5 posts in the blog that you are planning to move, you can try it out for a few weeks.
If you have the technical know-how you can shift to a self-hosted wordpress.org blog also which gives you endless possibilities.
Regards
Asif