In my opinion, a group blog is more compelling because we can share our idea or knowledge with the others. At the same time we can discuss about what we do not know.
Besides that, to maintain the blog is easy because our group members can update the blog if we are busy or don't have time to manage it.
With group blogging, it also make the blog looks like a forum. So, we can discuss to each other easily. The discussion that had been discuss also can be seen by other people or guest. This is very helpful for the other blogger or people who seeking for an information.
But, if you prefer to have individual blog. You must maintain your blog so that your reader always get the updated from your blog.
by Wan Othman