I can't believe that one is necessarily training harder than the other. I also don't think what we've on Primetime is necessarily indicative of how each man is training. Who knows how much of their training/strategizing each man is allowing to be filmed/shown.
Both are professionals, and both know this fight is huge. I don't buy into Rashad being complacent because he's been to the top of the mountain. If anything I think being knocked from the top would make him even more hungry to get back there. And Jones, well, he's the champion; his dedication to this surely can't be questioned.
To answer the question, neither. Both are surely training as hard as they can. Come fight night, they'll both be as well trained as they possibly can be.