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After doing a bit of research a long time ago, I can tell you that, basically, the main difference between methamphetamine and amphetamines(aderall), is that methamphetamine is less polar, which means it can cross the blood-brain barrier faster than the more polar amphetamine
It also depends how you consume it the speed at which it hits, and the effect.
If you wish to emulate the effects of adderal with meth, you may want to dose it accordingly, and take it in small amounts (5-10mg divided in around 4 doses)
Also, because meth is made by retarded people, you may want to recrystalize it so that you can be sure its pure meth you are getting, and not some dirty thing that can do severe damage to you (a good example is the crystals having leftover permanganate which will give you a parkinsons-like disease, permanently)
Amphetamines, and meth, like anything in life, can be abused in such a way that you can get away with it, just be sure to know what you are doing, and to not sperg out on it.