"Casino" doesn't have the bang-bang quick action of "Goodfellas," or the mordant humor. Instead, you get a long, thoughtful, richly detailed view of the Mob's involvement in Vegas in the Seventies. You also get DeNiro's best performance since "Goodfellas," another patented Pesci vicious character, and the usual first-class Scorsese casting--especially James Woods, the Sultan of Smarm, and Don Rickles. But the movie's almost stolen by Sharon Stone, who puts in a great performance as DeNiro's wife--progressively more debased, debauched and frightening.
Overall: If I had to take one of the two to a desert island, it'd be "Goodfellas." But "Casino" is a solid second.