CCS is an HQ choice, get's much better options, better stats, orders, etc. Excellent choice for leading almost any army. PCS is bought as part of a platoon, is a troops choice, has crappier options but is cheaper and can score. Usually a cheap throwaway unit you use for either sitting on a backfield objective or a cheaper SWS that you kick out of the back of your vendettas. But if you really want to know the differences, check your codex. It does a good job of explaining why they're different and how they work.
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