"Things like: type of Server / Client operating system, scaleability, maximum cardholders/ readers / inputs & outputs, ease and cost of integration with video, relatinal database type, maximum readers per controller, type of encryptin, core competitive controller administrative features that differeniate them in Access, alarm managment, reporting features, ..... Total cost of ownership over time may be good if it is available. For example, one article published showed that Lenel runs about 8 - 12 % cost of the system for annual maintenance. What about support?"
I focused on the Enterprise versions of the three, and built this loose matrix:
Some of the "?" mean the answer is unclear or contradictory in literature, but I'll work to get better answers.
Both Software House and Lenel are Access-centric incumbents, where Genetec originates from the video side. The scope of access experience the typical Genetec reseller and the SH/Lenel reseller could be very different. I have seen many institutional RFPs deciding between CCure9000 and OnGuard, but have yet to see Synergis 'break through' into the enterprise market as a mainstay option.
The support question is a good one: all three options have a generally filled-out service/resell channel, but the situation in your exact region may have it's own limitations.
Also, I have noticed a (at least regional) trend in CCure deployments that if the end user does not update and maintain current version support agreements, they are not supported. (ie: CCure 800 customers are out of luck unless they upgrade to CCure 9000.) This is not the case with the Lenel deployments I've seen, and certainly not with Genetec (due to its newness, no major update has hit the installed base yet.)
As IPVM expands testing, we will be in prime position to give you feedback on usability questions. We are testing Synergis shortly!
[UPDATED 10/7: to include Genetec's feedback on maximums.]