I could be wrong here about NCM because I don't use it and have only ever gone through the demo, but...
NCM is a part of the ORION suite, and even as only part of a whole, it offers things that Kiwi doesn't do efficiently,elegantly, or at all. Also, the Syslog server provided with ORION serves a different prupose, as an information gathering tool to help with network trouble-shooting or configuration trouble-shooting.
Kiwi on the other hand IS a Syslog server, handling syslogs is the primary function of the application so it needs to do it well. Logging to flat-files is an option, and it's the default option, but it can log to numerous file formats, database engines and ODBC data sources with some configuration.
There may be some configuration changes you can make to the Syslog server you have, but I wouldn't be able to tell you for sure.