Consider the sink with which you intend to install the garbage disposer. Thin, cheap sinks can't handle heavy-duty garbage disposals because they rattle the sink and counters and may cause damage to the area or the disposal. Use a lighter garbage disposal for inexpensive sinks.
Choose a garbage disposal with horsepower that can handle what you want to grind up. A disposal of 3/4 horsepower is good for most kitchens while 1 horsepower is ideal for those disposing of thicker, larger garbage.
Choose a batch feed garbage disposer for better safety. They can only be turned on when a stopper is applied to the drain, making them ideal for families with small children. They are also best when you plan to use the disposal on a daily basis.
Choose a continuous feed garbage disposer if you want a traditional approach. Rather than using a stopper, these turn on and off with a flick of a switch much like how you turn on a light. Pick a continuous feed disposal with a reverse function to help eliminate jams.
Purchase a commercial garbage disposal for big businesses, such as restaurants and school kitchens. These can handle constant use and larger loads of garbage to grind. They also have a higher horsepower. These aren't typically appropriate for home use as batch feed or continuous feed disposals are sufficient.