Waste King Legend Series Garbage Disposers
There are two differences between the Waste King EZ mount system and Waste King 3-Bolt mount system garbage disposers. The 3-bolt mounting system has all stainless steel mounting components, the EZ mounting system has plastic and aluminum mounting components. The 3-bolt mounting system has a non removable hush cushion (splash guard), the EZ mounting system has a removable splashguard. There are no differences with the motors or performance.  The EZ mount system is true to its name, it is indeed easier to work with than the 3 bolt system.  Neither garbage disposal style is considered better than the other.  They are both very durable mounting systems.  It is solely a product preference.