Well Supra would be better on the motorways as the top end is way higher than any starlet, also the car would feel a lot safer on the high speed, not to mention that the Supra has A LOT better brakes and more traction then the Starlet. Also if you have a few mates in the car Supra have more space and the weight wouldn't make any difference at all for the car performance - that would also mean that you can have a massive stereo system in Supra and it won't affect the performance, in fact heavy subwoofer in the boot will improve the traction -))) Another thing that 550 bhp Supra will be a lot more RELIABLE then a 320 bhp Starlet pushed to the limits.....