Hi !
beushless motors require less maintenance (no brushes to replace) than a brushed motor. They are also more energy efficient although I don’t know if that’s significant in the RC world.
i replaced the silver can with a 17.5 turns into my stadium thunder, it’s faster but not by a huge margin. The real difference is the « punch » of the motor (and the car): acceleration is way better, making the car much more responsive