Thanks for your comments. I currently have a 42-inch craftsman tractor, it is not a ZTR, it is 14 years old, I do not complain about the service it has provided. I want to buy a new tractor and wish recommendations. My doubt in these two Snapper tractors is the engine because in this forum many people indicate that the Kawasaki engine is much better than the other brands. The Briggs & Stratton Commercial as compared to the Kawasaki in quality and power. The deck the Snapper Pro is ICD Cutting as compared to the deck Model 560Z in cut quality is similar or has a big difference. The Snapper Pro S50XT has smaller tires than the Model 560Z, my doubt if having small tires has problems getting stuck in non-flat terrain.