Road need to be easy to follow and understand. A lot of the times, I start to have issues with roads when they branch off at weird places or end up going up large hills/mountains.
I think that CT being center of map is the best and avoid the need for additional hubs since all roads led to Rome.
I do wonder rather than a circle, its more a spiderweb type of design.(Dunno just a random thought).
I think circles have great potential if done right. From what I heard the issue with the circle was no one could build in the circle so anyone to far out from it, was out of luck. Perhaps work on that kink and see what can be done.
I think best road is Aegis though.