We have one of each, steel one for the calves first few times in a shoot and aluminum for once they get used to it. The aluminum is more handy for shows by far, much easier to carry around then the metal. We do take both to shows because we usually show 6 calves, and I'm always racing my brother to the aluminum one because it is much easier to work on a calf in. If you have a crazy calf though I would not recommend the aluminum.