Can't be answered without the serial number.
Not possible to give you a single answer- depends on best for WHAT? The VP70Z was a full auto machine pistol, and the p9S a target pistol. Each a good gun for its purpose. The P7 series would be a good concealed carry gun, etc. Some folks like chocolate, some like strawberry- and the best ice cream or best pistol is a matter of opinion.
Depending on condition and exact version, anywhere from $2,000 to $4,000. You are going to need a "hands on" assessment.