You'll need to check that the dishwasher you are considering will accommodate your unique items. The internal configuration of a dishwasher determines the size and types of items you can load. An arm under the top rack will limit the size of plates or platters that you can load in the lower rack. Some models offer adjustable upper racks that can be raised, lowered, or tilted to make space for taller items in either the top or bottom rack. Racks may have dividers that fold down.
Dishwashers also offer different cycles.
These differ in the number or length of washes and rinses in the cycle. A sanitizing cycle will boost the temperature of the rinse or wash water. Your household size, cooking style, and consciousness about energy and water usage will determine which of these options are important to you. The October 1993 issue noted that dishwasher performance varies more than does the performance of other types of major appliances. And Energy Dishwashers vary in the amount of water they use.