Amphetamine sulphate versus amphetamine phosphate, differences?

[JohnBoy2000]

Anyone well informed on the differences between the sulphate and phosphate versions of amphetamine?

As I understand most amphetamine will be bulked up with caffeine powder so an acetone wash is a given.

That aside, I believe the conventional purity of sulphate tends to be higher than phosphate?

Something something......... the rest is the "salt free base".

Apparently outside of pharma synthesis, racemic versus dextro is available but who knows if that's legit.