I think WordPress is not only more professional, it's much, MUCH easier for readers to leave comments on. There's nothing worse than wanting to leave a comment on a blog post, and having to jump through the hoops that Blogger sets up!
For that reason alone - to encourage readers to leave comments and make it easy for them - I'm a fan of WordPress. I started blogging on Blogger, and migrated to WordPress. It wasn't hard.
Happy blogging! :-)
Laurie
