your son has apparently experienced positive results with
Concerta which is a form
of methylphenidate, while Adderall is a form
of dextroamphetamine (Ritalin and Dexedrine). Frequently the forms of methylphenidate work better for ADHD Hyperactive while the dextroamphetamines work better for the Inattentive.
Which is your son? To compound matters further if he is an "active" young man, is his activity "motor" or "distractablitIy" driven?