Blogger & Serendipity

I am working simultaneously on two different blogging software programs : Blogger and Serendipity, a program that was already installed on my hosting company�s server. By the summer I want to set up a blog for each of my technology camp students. Requirements are that the blogs are hosted on our school servers and that only registered users (students and their parents) have write and read privileges. In addition I will set up blogs for my school�s classroom teachers over the summer to be used next school year.I will compare both interfaces and need to evaluate ease of use and their features to decide which one will best suit my purpose.