Who should turn first?

-I recently came to a stop sign where there was a right turn only. I signaled and was about to make the appropriate turn in my car. A motorcycle then appears to my right following my stop (there is no other right turn lane) and as I make my turn, he decides to turn as I do, right beside me. In a situation like this, which driver should turn first?Motorcycles normally go first because they are small machines with much faster acceleration than a car. Experienced drivers tend to expect the motorcycle to go first
Usually the vehicle that arrives first has priority.