Mami Tomoe and Train are both exceptional fighters with guns. They won’t miss a target no matter how far away you place it. That being said, Train’s lightning fast agility allowed him to dash past a crowd and to his target in the blink of an eye. It was an incredible feat and not one that I believe Mami could match. She has a lot of durability and can tank a lot of damage, but her crystal is a pretty big target for Train. He won’t miss the decisive shot. Train wins.
Update 8 7 2020 Mami’s speed makes this fight a quick one. Mami Tomoe wins.