Can you tell me for adderall and ritalin (methylphenidate) - which one is better?

The one that works: Every kid is unique; their response to any medication or dosage will differ from the next kid. Many have concurrent problems that add to their problems like ocd, depression etc. And the medication or medications must work well together to get to a well functioning kid. Methylphenadate based products are my first line choice, with &> 90% response, but some do better with other meds.

No difference: The two medications are equally effective for ADHD. Adderall is made to last about 6 hours, Ritalin about 4 hours. Long acting forms of Adderall XR is made to last as long as 8-10 hours, Vyvanse (lisdexamfetamine) lasts as long as 12-15 hours. Extended release forms of Ritalin include ritalin LA - 8 hours, Concerta 8-12 hours.