His spam game is better, and his waddle dee's stay on the ground, nullifying a lot of your projectiles. ****ing annoying as hell. The random spike thrown doesn't help either, it's pretty freaking unbalanced IMO.
His aerial mobility is also good, making it a survival challenge each time you try to get to the edge as he keeps chase and edgeguard.
His ftilt has insane reach. Chaingrab, all that stuff.
Good news, big character, you can get both fsmashes in at early %, also he's an easy target for zair. And even though his waddle dee throw really hinders you projectiles, they still work to an extent. Also careful about being aggressive, any DDD player who knows about chaingrab will to do it, with shield grabbing. Your ability to grab back will be pretty important. But, Link stupid nerfed hookshot is like, one of the only grabs that are slow as hell, and won't be able to help you out of an A combo. DDD also has a bigger range on his grab than what it visually seems. Other than that, a lot of DDDs moves are slow, know the right time to attack.