Looking closely at those two, IF investment is part of the thinking, the McCarty will hold more value. The 22 is a non ten top so it won't fetch as much. I know how much the 22 is going for. I don't know how much they are asking for the McCarty. So that could factor in. Also, I would ask the cu22 guy to tell you if the neck is "Wide Fat" or "Wide Thin". The trem 22s had both in that era. And that could also factor into your decision as it affects playability. They weren't doing "pattern" necks yet. The McCarty wouldn't have a wide thin.
The reality is that I am pretty sure, as a first foray into PRS, either one you would get would have you playing for hours on end in full on bliss....