There difference is not only in potency as I'm sure you're all already aware. Yes, if given the choice, folks will always reach for the Amphetamine first. I think it's more like "what's better for pulling a cart, an ox or a horse?" Well, both have advantages. Oxen are strong and sturdy, horses faster and more adaptable. You need to consider you own needs and the specific effects of the medications involved.
There is not an objective answer either. What works for one will not necessarily work for the other. I would recommend responisible experimentation if you truly are trying to treat your condition.