Wheel size

[Skyedriver]

Moving along from my last thread, wheel size. There's a car we intend to view tomorrow and it's on 15" wheels, some cars seem to be on these others on 16" or 17" wheels.
I'm guessing the ride is better on the 15" but what's the best option, the car is for my wife who will prefer comfort over teeth rattling suspension.

[E-bmw]

I think you have just answered your own question.