Magnetic or friction resistance. As in everything in life, there are also opinions of all tastes, so we are not going to assess whether one is better than the other, since there are people who feel more comfortable with friction resistance and vice versa.
Magnetic resistance is an evolution of friction resistance. The braking system consists of the distance or approach of electromagnets. Unlike frictional resistance, this one uses the friction of the shoes pressing the flywheel. Magnetic resistance is more accurate, quieter, and maintenance-free.