Network Edition or OSS? If it's NE then it's RHEL as support for openSuSE 10 will end shortly. If it's the OSS version then I'd go with CentOS (a build of RHEL).
RHEL (CentOS) is a tried and tested stable server platform, openSuSE isn't. You get support with RHEL and none with openSuSE.
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Regards
Bill
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