Effects - amphetamine vs dextroamphetamine (dexetrine)

[wrwm4]

Swim on occasion takes adderall for study purposes. Today swim didn't have any adderall but came across an ADD medication called vyvanse, which he believes is a dextroamphetamine, (lisdexamfetamine dimesylate to be exact), compared the adderall which is a mixture of amphetamine and dextroamphetamine salts if he is not mistaking. swim feels a bit more jittery than when on adderall. still very focsed on getting things done, but his mind seems to be jumping from task to task. Swim is wondering what the different effects are between taking adderall, (amphetamine/dextroamphetamine mixture), and vyvance, (just dextroamphetamine). is one more effective or more potent than the other? any other information on the topic would be appreciated.