Please do a search, this has been discussed many, many times.
Dexedrine is considered by most people to be more potent mg-for-mg than Adderall is. Adderall is around 3/4 dextroamphetamine and 1/4 levoamphetamine. Dexedrine is 100% dextroamphetamine.
Dextroamphetamine is considered by most people to be more recreational, but Adderall works better for some people.
I'm going to close this thread - there have been dozens of these threads already - please use the search engine.