I agree. I wonder how much of their builds are cake. I didn't even see any cake in Duff's creation. They both use a lot of rice crispie treats though, along with other non edible materials.
You're right about Duff's cake being more imaginative. That's why I think he's better. Buddy is good, and does good work, but doesn't really step out of his comfort zone. The dinosaur was amazing, but I think the face/nose could have been a bit longer. It just looked a bit off to me. The city was incredible though.