I'm going to have to start charging DC consulting fees.
CTSC uses the D2OL client. O/S's supported are Windows, Linux, Solaris, and Mac OS 10.1+. No SMP.
There is a default client mode for each O/S, but the controller can be set to run as Java, CLI, or file based.
As far as which CPU is faster, etc., you will have to determine that for yourself, or go to the D2OL forums and try to find the info (I don't recall that the CTSC forums had that info). I can only tell you my experience. I found that the Linux client (default settings) runs about 25% faster than the Windows client. This could be for a number of reasons. I average about 95 candidates/day on an MP@1.533 GHz and about 120 candidates/day on XP@1.917 GHz.
Just to give you an idea of how underpowered this project is, the XP and two MP's listed above are the top three nodes overall for weekly production.