Mercedes made a test car 50(!) years ago that has a much higher top speed than the
Veyron. The truly important factor is engineering. Like Gumball said, the Mclaren F1 is a finely engineered piece of work, while the Veyron is an engine on wheels. Top speed is very rarely important. What matters is acceleration, handling, and braking, all of which the F1 has. This is why the Mclaren F1 wins almost every race it enters, and is still my favorite car.