I think that having both forms, salt and freebase, on hand is helpful in a versatility way. One can pre-dose sublingually with harmala salts, and then get into Changa or F.B. DMT with the activation help of the Harmalas.
The salt can be quickly turned into freebase and vice-versa, so it really doesn't matter that much. Kept in a cool, dry place, sealed in glass, I have not noticed any degradation of either form over a period of 10 months+....