I would have to suggest America. The sheer size of the place means that you can drive for hundreds of miles through unihabited desert on dead straight roads, twist through snowy mountain ranges or vast thick forests, or (as if you would want to!) crawl through a bustling metropolis.
Basically, America is so large it has to have good roads. Think how many times Germany would fit into it.
In England we have too many cars and not enough road so even if there is a good road, no chance of driving it well. America has got to be the opposite.
However, this is just an opinion, and maybe someone from USA maybe able to say if this is at all true.
