Save yourself a lot of hassle and go with the same brand & model. By doing so you'll avoid having to remount and mess with the drain & sink connections. Save the old power cord so you don't have to buy a new one. You'll need to do some very minimal wiring work to pull the wires from the terminals in the old disposal and attach them to the disposal. Make sure to attach the green grounding wire to avoid getting shocked when you switch on the disposal!
With so many different models of garbage disposals to choose from, it can be difficult to figure out which one will best suit your needs, especially when you begin looking at all of the different features each model has to offer. Reading garbage disposal reviews will be much easier if you know what you are looking for. Here is a glossary of common features found on most modern garbage disposals:
A sink flange is the uppermost portion of a garbage disposal.  It is the point where the sink, drain, and garbage disposal meet, and it keeps debris from clogging your drain.  If you have a leak at the uppermost area of your garbage disposal, the source is likely your garbage disposal flange.  The two most likely reasons for a flange leak are that the mounting bolts have loosened and that the plumber’s putty has failed.
InSinkErator garbage disposals provide a convenient and environmentally-conscious alternative to sending leftovers to landfills. Capable wastewater treatment plants can even recycle food scraps into energy and fertilizer. Plus, using garbage disposals can significantly reduce the amount of trash sent to landfills and reduce greenhouse gas emissions.
The company Waited hired has an “A plus” rating with the Better Business Bureau and has been in business for 14 years. They didn’t do anything wrong, so CBS4 is not naming them. They didn’t want to discuss the charges. They stand behind their billing, but they didn’t like having a customer who was unsatisfied. The company agreed to refund $400 to Waite.
An affordable option that offers outstanding value, the Waste King Legend Series comes backed by a solid five-year warranty. The stainless steel disposal is compact enough to install under most sinks. The continuous feed design means this disposal requires just a flip of a switch. It runs very quietly, but it is still powerful enough to grind food waste efficiently.
Modern garbage disposal units connect to dishwasher drainpipes.  This enables dishwashers to expel leftover food scraps and residue that would otherwise accumulate in the dishwasher unit.  A common source of leaks is the area where your dishwasher and garbage disposal connect.  These leaks most often occur when the hose’s clamp is not secure enough and when the dishwasher hose cracks.  To fix this issue, simply replace the cracked section of the hose or tighten the clamp.
Energy usage is not high; typically 500–1,500 W of power is used, comparable to an electric iron, but only for a very short time, totaling approximately 3–4 kWh of electricity per household per year.[34] Daily water usage varies, but is typically 1 US gallon (3.8 l) of water per person per day,[35] comparable to an additional toilet flush.[36] One survey of these food processing units found a slight increase in household water use.[37]

STEP 3 – Clear out the disposal to remove any bits of hard foods, bone shards or other fibrous gunk that may be preventing the grinding blades from rotating and pulverizing your discarded food. Use a tool (a pliers, wooden spoon, etc.) to do this. Putting your hand in situation where whirling blades of destruction are nearby is never a good idea. (That is what I’ve heard anyway.)
The 2 800 RPM motor-powered dual stainless-steel swivel The 2 800 RPM motor-powered dual stainless-steel swivel impellers built into this GE 1/2 HP Continuous-Feed Garbage Disposal join forces with a 2-level pre-cutter to make it easy to grind undesirable waste into easily drainable particles. The disposer's large-capacity disposer chamber is comprised of a cold-rolled carbon steel armature shaft ...  More + Product Details Close
If your garbage disposal is making a clicking or rattling sound, there may be some food particles that will not grind up inside. Remove power from disposer, reach into the sink hole with a pair of tongs and remove anything that is still down in the disposer. Test your disposer to be sure the noise is gone. If not continue troubleshooting your disposer issue (see below).

Garbage Disposal Replacement