I recommend the 14-way seats. I have both 14s and 18s (Macan Turbo and Cayenne GTS). I'm 5'10", 185 lbs and the 18s are snug.
I also don't like the 18-way seats. The bolsters are just too tight, but not where you'd expect them to be tight (in the butt area).
I am 6' 250 and my wife is 5'4" 110, and we both have (had) the same complaint: the bolsters hit us just above the knees, and we can't sit with our knees apart in a normal comfortable position.
We had to get out and take a walk after every hour in the seats - passenger OR driver.
We traded ours because of the seats. In retrospect, we could have bought some Recaro or other premium seats, but then we'd have an unsale-able car. We took the hit and went with 14 way.
We tried several other things to get comfy in the 18-way seats. Sheepskins, pillows, wedges - nothing could get rid of that bind on the lower thighs.
My 250# frame liked the butt space, but that wasn't the problem.
The narrowness up front also compromised my pedal action because my knees weren't in line with the pedals. 1/4 second delay on track days. Kind of like heel and toeing but it was knee and toeing.