Kanon for me, it's way shorter than Yakitate Japan!, but in my opinion, it's the better of the shows. It was a nice romance and had great characters and pretty good, although sometimes generic, comedy and character development.
I'd say Kanon... because Ayu's uguu is cute. Also it had a nice story, so it's all good. I watched some of Yakitate Japan, it's okay, but I never really caught up with it.