ResScan will give you lots more detail. You can see, for example, what's happening with your breathing pattern when your pressure is automatically adjusted by the machine. You can also see your leak rate graph, which is really the only way to verify that you're not leaking too much.
SleepyHead is much easier to use than ResScan, but since SleepyHead is beta, you'll often want ResScan to verify that what you're seeing in SleepyHead is accurate. Also, if you want to discuss something you see with your care providers, they will trust ResScan more and are often unwilling to even look at anything you print from SleepyHead.
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