To be specific, Vyvanse/Elvanse is lisdextroamphetamine.

But IMO it's not really that incorrect to say there are two main types of stimulants.

You rarely (at least never where I'm from) get instant release methylphenidate. Always some delay mechanism. Shorter - Ritalin, longer - Concerta.

And the lizine particle attached to dextroamphetamine acts as a such delayer, but isn't active by itself -- being only an amino acid. So it's still kind of amphetamine just as Concerta is methylphenidate.