I guess it all comes down to what you use your car for as not everyone likes the track. One of them names is a professional race car builder so will no doubt turn out top spec cars as he dose. The other is a pure track car with to be fair no better chassis set up than the car that's takes the straight line name tag off people lol which to also be fair has the best of everything that can go on one to make it corner very very well. I'd also have to say there be a point in anyone's life wear building a car physically becomes impossible and that point is way before the age of 70+ in my opinion