A cupsole is a onepiece, less flexable sole.
a vulcanized sole is a two piece sole, and is usually way more flexable.
cupsoles are better for high impact skating and usually result in less heel bruises.
vulcsoles can be used in any type of skating as well, but your feet might hurt more after skating stairs, rails, or gaps.
ie. emerica reynolds 2= cupsole
emerica reynolds 3= vulc sole