Iv had my own questions bout this exact thread. Iv only done a little testing and from my admitedly limited research iv come to the conclusion that the Bobs are pretty equal when you yourself are interacting a lot with their races. Its when they are left to their own devices that their personalities seem to determine how they drive. I did testing using a 5lap race on the High Speed Ring, oil changing each time so it was a fair comparison & with exactly equal level Bobs. My conclusion? All drivers, once far ahead enough, will be driving on an extreme blue meter, and intetestingly the coolest driver's put in the fastest consecutive laps, therefore making them more suitable for the endurance events. The Hot Heads seem to do better in the closer, more intensely fought races, driving harder and overtaking more readily