18's versus 19's rims? What do you prefer
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If you have the luxury of smooth roads and no hidden potholes, the 18's will work fine, and are a standard option.
In suspension design, the tire is considered to be a spring in series with the coil spring. In the 16"-17" range, it is soft enough to influence the ride comfort. The larger the wheel dia, the shorter and stiffer the tire sidewall, and the stiffer the ride. Look at the sidewall of a 19" tire with same OD as the spec tire options. They have "rim protecting" sidewalls that are thick and stick out to be over the edge of the rim. Those tires have no give, resulting in a stiff ride. You also must use very little camber with these.
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