This isn't even a contest, Riven blows both the other Myst games and any game in the genre completely out of the water, and it's one of the best games of all times imo. No other game I know of blends puzzles, setting, dialogue and the players own intellect so well together into storytelling. This game doesn't spoonfeed you the story at all, you have to put it together yourself, discover the info within the info. If you ask (and answer) the right questions this game will blow your mind. If you don't ask the right questions it will still be a good game, but not as formidable. It makes for great replay value that is very uncharacteristic for the genre, because you can have a different experience when you access the game differently in a next playthrough. In fact if you really want to know what's what in the world of Riven, I really recommend playing this game several times. It's the little details that can escape you several playthroughs, and hit you in the face the very next time because that session you did drink your coffee.