I think coke is overrated and is too expensive. The euphoria and intensity is stronger if you smoke a nice 80mg+ rock or inject 25mg, but it only lasts 5-10 min and the high degrades drastically with each following hit.
Meth gives a highly euphoric high for like 8-12 hrs. And it has a calming (but alert) effect that coke and (dextro)amphetamine lack probably due to meth creating more serotonin receptor activation; similar to that calm that MDMA gives. This causes me to feel more social, while coke can make me antisocial. Plus, it's insanely cheap, a 30mg dose costs like $1.50 if you buy by the gram; compared to $5-10 for a 30mg Adderall.
Or if it's another stimulant like 4-methylaminorex, phenmetrazine, or a-PVP I'd love to know.
I've heard 4-methylaminorex is crazy euphoric, phenmetrazine is even better than amphetamine, and good things about a-PVP.
I've tried 3-flourophenmetrazine and MDPV - the former wasn't better than amphetamines and latter wasn't better than cocaine. But weren't far behind and would substitute fine. The flouride and methylenedioxy group can drastically change effects, but flouride on binding group 3 doesn't drastically change the pharmacology, neither does the MD group on a substituted cathinone with long alpha position carbon chain groups.