Super Mario All-Stars has countless hours of magnificent gameplay, making the game an absolute masterpiece.
You are probably thinking that the 3 Mario Bros. games will be crappy because they are NES games, but think again, they are now remade to suit the SNES, featuring much better graphics and sound, making the games superb.
Each game is very fun and long to play, meaning that All-Stars has excellent value. Super Mario All-Stars would definetly be the best SNES game and probably the best value game ever made.