Advantages of Xymon vs Nagios?

I have almost completely phased out nagios. I work at a financial services Company and security is one of our top concerns.Having the agents send to the server and not having to open any additional ports is a big plus.
I put together a powerpoint presentation for management explaining why I wanted to move to xymon, and after looking at alternatives.
here are some of the text portions


opsView - 
OMD -   

HTH