The answer to this question depends on the individual's preferences and goals. Generally, a heavier flywheel will provide more resistance and create a smoother ride. This is beneficial for those who are looking for an intense workout or prefer the feeling of riding outdoors. On the other hand, lighter flywheels can be easier to accelerate which may be preferable for those who want shorter workouts or enjoy sprints. Ultimately, it comes down to personal preference and what type of cycling experience you're aiming for.