How I see it.
Total Design (including interior)
1) Rapide
2) Panamera
3) Wagon
Total Performance
1) Panamera
2) Wagon (very close second, near as much makes no difference probably)
3) Rapide
Total scoring, lower better, money no object.
Panamera = 3
Rapide = 4
Wagon= 5
Taking money into account for total value for dollar, though I can't remember them off the top of my head, probably reverses as the spread there is pretty wide.
1) Wagon
2) Panamera
3) Rapide