Here's my new comparison:
SMB3 - This is my favorite. It has 90 levels in 8 worlds. Power-ups are Mushroom, Super Leaf, Fire Flower, Goomba's Shoe, Tanooki Suit, Hammer Bros. Suit, and Starman. This has 2 remakes: Super Mario All-Stars on the Super Nintendo, and Super Mario Advance 4 on the Game Boy Advance. (I like SMA4 the best) Story: When Bowser attacks the Mushroom Kingdom, the 7 kings in every world were transformed. Then the Princess tells the Mario Bros. to save them. While they're on their journey, the Princess gets kidnapped by Bowser (of course...) And then Mario and Luigi beat him to save the princess. I got that information from Themushroomkingdom.net.
SMW - This one is still fun. It has 96 levels. Power-ups are Mushroom, Yoshi, Fire Flower, Cape, Super Leaf (only in the beta), and Starman. This has 1 remake: Super Mario Advance 2 on the Game Boy Advance. Story: Mario, Luigi, and Peach go for a picnic in Dinosaur Land. Then, Mario and Luigi want to go have fun and fly around. They come back, and Peach is gone! They are surprised. Then they go meet Yoshi to save the princess. I got that from the GBA version.
SMB3 is better!!!