I voted right-handed MtF. However, it might be noted that in many cases, especially the older generation , like me, that children essentially picked up hand movements observing a parent and "mirrored" that. i.e. using the opposite hand.
In Kentucky, and elsewhere as I recall a child using their left hand when beginning school was re-taught by teachers, and that included hand smacks with rulers, harsh comments, ridicule by adults and the other students, repetitive writing exercises, or whatever it might take - to train the child to use the right hand because so many things are created for a right-handed person. It was believed "back then" by doctors that left-handed people were not as smart as the left-handed people. So there was a stigma attached to make sure a child used the right hand.
Myself, I started out in school as a left-hand writer.