Favorite Enterprise Access Control For Genetec Security Center VMS?

Spring boarding from the reverse class discussion on VMS's for Lenel, and also from other public discussions comparing access control systems - my question is to compare:

With Security Center as the VMS and UI, the choices of integrated access control are Ccure, OnGuard, Synergis/SMC, Synergis/Mercury.

The scenario is an existing 200 door installation with proprietary non-Genetec integrating ACS.

Thanks!

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