Both the Metcon and Romaleos can be used for CrossFit training. The Metcon is more versatile, making it suitable for various types of exercises, while the Romaleos is a dedicated weightlifting shoe. If your CrossFit workouts involve more weightlifting exercises, the Romaleos may be the better option. But if you need a shoe that can handle multiple types of workouts, including cardio, then I would go for the Metcons.