For the first answer you dont drive a motorbike you ride it.
It depends on the rider and when he or she changes gears. If the race was a short distance the 2 stroke would win because it has more axceleration, for long distance the 4 stroke would win.
actually 4 stroke engines are used for higher efficiency
2 stroke produces more power than 4 stroke 4 same size
2 stroke consumes more fuel than 4 stroke but can b faster than 4 stroke