Which is faster round a racetrack - a Porsche 911 or the Yamaha R1? Would you rather have a Ferrari 360 Modena or the new Aston Martin DB7 Vantage? Which is the best road-going rocketship - the BMW M5 with Tiff Needell at the wheel or JC’s Jaguar XJR? Which of the new Japanese super tech cars is bes ...