Which do you like the most? whether it is a texture or a model. One of mine is Final Frustration.
If it has Mewtwo2000's name on it, it's my favorite. I really enjoy Bowser Boss Fight from Mario 64 stage.
The Castlevania stage that goes over Luigi's Mansion, and the one that was a throwback to the first Smash Bros., when the Hand drops a trophy on the table.