As noted above, U.S. 997S buyers don't get a choice.
For U.S. 997 3.6s, then:
PASM
PROS: Lower ride height (better looks), better comfort in Normal, more sportiness for track days in Sport.
CONS: The "movement" WE have experienced in early PASM 997s (may now be gone), Sport is too stiff for most situations, but does seem to mellow if you leave it that mode for a while on a rough road. Or maybe YOU get used to IT?
Non-PASM (standard suspension):
PROS: More clearance for driveways, etc. Strikes a VERY nice balance between sport and comfort - might be best standard 911 chassis of all time. It's a great chassis, one that I prefer for backroad driving pleasure over PASM hands down. And, for track guys, no-brainer replacement with coil-overs.
CONS: Not as comfortable over the road as PASM in Normal, high ride height and -- for those who care -- not as good looking.
It's a HARD choice. How you drive and your thresholds for clearance and comfort -- as well as future plans for the car -- should be your guide....
pete