There isn't a whole lot of difference in the servers really.
There are a few of us working on each version and as soon as we make any improvements, the code is shared across all three projects (with minor modifications of course).
All it really comes down to is which version you like best.
Osrose is the oldest project. I isn't publicly updated much lately but there are huge changes going on behind the scenes with the upcoming (eventually) rev 81.
Osprose is the newest but we took the source for osirose and modified it so we are just as complete as they are. Well actually not quite in some cases. Arnold has already implemented AIP where we haven't yet. I have it running pretty well on my public test server at ktrose.no-ip.org but I haven't finished it to the point of uploading it to the SVN yet.
Just try out all three versions and decide which one you like best.
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