Most people's dominant leg is on the right, so the power transfer is closer to the more powerful leg, so the more powerful leg has less of the bike to distort before it reaches the transmission.
It is easier to trackstand with your dominant (right) leg forward, and the front wheel pointing to the right. when trackstanding you have more control with your forward leg close to the drive. We ride round the track anti clockwise, to the camber slopes up to the right, a slope also helps us trackstand. I'm sure someone could put this all more clearly than I can.