[Full-disclosure] Host IDS

I have been following this list for some time now and most of the folks here know their stuff others well, we all have our moments. If you had to pick a host based IDS and your choices were:
1.  ISS Proventia Server Sensor
2.  Cisco Security Agent
This would be for a windows 2003 environment.
What would be the reasons for one verses the other?  I have my own list just wanted to get a sounding from this group.
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