Difference between Home Depot vs. dealer equipment

I remember hearing a few years ago that if you bought a John Deere lawn tractor at Lowes or Home Depot they're not made to the standards as the machines at actual John Deere dealerships. Is this true? I'm beginning to start my research for purchasing a new lawn tractor next spring. My 42" Craftsman is ten years old now and I'm certain things will start to break.

Thanks

Bob