I have experienced too much degradation of both leather and plastic material over the last twenty to thirty years to know what's what, leather needs feeding and oiling to retain its properties, and plastic deteriorates in numerous ways from stickiness to brittleness. Leather that outlasts the car seems stupid, my friend and I have a complete set of Saab 9000 Aero seats that we salvaged from my car about 15 years ago, still waiting for either of us to turn them into useful seating for the home.