Which one makes more sense?
G37 is strongest for daily-driven luxury performance, while the 370Z is strongest for two-seat sports-car focus. The answer depends on the exact configuration, the quality of the individual car, insurance, maintenance reserve, and how often the car must serve ordinary transportation.
Do not compare only the headline numbers
Used-car ownership is affected by tires, brakes, modifications, records, accident history, and deferred maintenance. Use this table as a starting point, then inspect the exact year and trim you intend to buy.