I love many N64 games, such as Gauntlet: Legends and StarFox 64. The games of the 64 seem to rival easily the creativity of the games of today's systems.
However, the Wii's interactivity is really great. Games like Super Mario Galaxy and The Legend of Zelda: Twilight Princess are going to be the table turners for me.
I've never really gotten into PlayStation or XBox, so I'm going to say that the Nintendo Wii is my favorite gaming system.
The PlayStation 2. It has all of my favorite games on it, the controllers don't require batteries, it has a long life, and the gameplay of the games are wonderful. On the games, they focus more on gameplay than graphics, which is what I like. However, it does lack online gameplay. I know you can play online on the PlayStation 2, but I haven't found anyone on there.