It has the highest top speed, granted.
But it is not the most impressive. Compare the interior of the Ultimate Aero and the Veyron: there is no comparison. The Aero is a race chassis with a huge engine and little in the way of comfort. The Veyron has an option of magnesium indicator stalks to look awesome, and to save weight!
Also, if you watch the
episode of Top Gear UK where James May tests the Veyron to its top speed, they make mention after the film that the car is "totally undramatic" at such ridiculous speeds, and compare this to the fact that in all other hypercars which are capable of similar speeds, you feel as though the car is at its limits, whereas in the Veyron it is comfortable and quiet.