Blogger or Wordpress, that is the question?

I am having difficulty deciding if I want to keep blogger or switch to wordpress.  Are there any pros or cons to wordpress?  I like my blogger site, but I have no idea if I am utilizing it's full potential.  I admit I am new to blogging and really have no idea what I am doing.  Most informational posts advise you to comment on other peoples blog posts, but it seems I guess I don't understand how that will get more exposure to your blog.  Another thing I am having difficulty with is what to put on my blog.  I make digital graphics: digital paper, clip art, invitations, cards, recipe cards, and the sort, I post links to those items I sell and I have some free downloads, but I am not sure what else I should put on my blog. If anyone has any advise on what I can do to improve traffic and content I would greatly appreciate it!!  Thanks and XOXO, Jeanne