You probably already know this, but adderall's formula is:
1/4 dextroamphetamine saccharate
1/4 dextroamphetamine sulfate
1/4 (racemic dextro/levo-)amphetamine aspartate monohydrate
1/4 (racemic dextro/levo-)amphetamine sulfate
Whereas Dexedrine is exclusively:
1/1 dextroamphetamine sulfate
The levorotary stereoisomer is responsible for more physical stimulation than mental stimulation, which is why people often consider Dexedrine 'clearer', or 'cleaner'. Adderall too me feels more 'intense' but less 'clean'. So it really depends what your after, or if you will, what floats your boat.
Anyways, welcome to Bluelight!