There was a poll that also asked what was the best stimulant; meth/amphetamines blew crack/cocaine away.
best stimulant != most useful/euphoric one. I wouldn't hesitate a second if you asked me which one was a more useful stimulant, but if you are asking about euphoria alone, you can not honestly claim that anyone would say amphetamine is more euphoric than cocaine.
http://www.ncbi.nlm.nih.gov/pubmed/15582920
I actually went over the study and while the results seem to indicate amphetamine coming out as a winner in terms of positive effects, it is a very close race and there are some major flaws in the study. metyhlphenidate can also produce some major dysphoria. i honestly fucking hate both methylphenidate and cocaine, but the peak euphoria ive experienced with each one is just much higher for both methylphenidate and cocaine over amphetamine which ive used daily for years.
I honestly dont have the energy to look into if and why your claims are true or false based upon the pharmacodynamics, but maybe you could point me to an article that will make this clear.
I might have exaggerated with my last sentence and you might actually be right that the majority of people finds amphetamine more euphoric than methylphenidate, but such claims arent very easy to proof and ridiculing any statement that contradicts your statements ("haha") is quite questionable imho.
also extending such observations to other substances with a similar (!) mechanism of action, as you seem to do with methylphenidate and cocaine, is plain wrong (just like its wrong to say, analogously: "dogs are bigger than cats"). if you actually claim that amphetamine produces greater euphoria than cocaine, than i really need to see some evidence for that because its plain absurd judging by all ive seen in others and experienced myself.
EDIT: I'd also like to note that i think methylphenidate is a completely different beast when iv'ed or used rectally, while ive never found that to be very impressive with amphetamine at all over administering it orally. when using both orally i would actually agree that amphetamine is the clear winner in terms of euphoria. intravenous amphetamine simply stimulates me faster, but there is no rush to it as there is with methylphenidate (or cocaine). methylphenidate is just crazy when it's iv'ed or used rectally, <its effects are really strong>.