You always inflate the tire to the vehicle manufacturers recommendation which will be less that the max on the tire, usually.
If there is any question whether or not this is the correct way to inflate the tires look on any tire manufacturers web site and they will say the same thing.
Overinflating can cause excessive stress on the tire, Less traction, and more braking distance. Not to mention a ruff ride and the premature wearing of tire tread, typically the center tread.