Manual vs Electric Juicer
The first choice you have to make is choosing a manual vs electric juicer.
A juicer is conical-shaped kitchen utensil used for squeezing or extracting, the juice from various foods, especially fruits and vegetables, for the purpose of drinking or adding flavor to other foods. The juicer is simple to use, but, because of the possible dangers involved, should be handled with care, caution, and know-how.
Two kinds of juicers exist a manual, or hand-operated, version and an electric version.
Juicing consists of placing fruit wedges or vegetable slices cut-side-down in the center of the juicer and then pressing down to squeeze the food and moving it back and forth so the juice will run out of the rind and away from the pulp. The pulp and seeds are collected along the edges of the juicer, and the rind is then discarded.
Electric juicers mechanically extract juice from fruits, vegetables, herbs, etc. The proper operation consists of placing the article of food within and pressing the button. The juicer then automatically squeezes the juice out of the food. Because of its mechanical nature, electrical juicers are far more dangerous than manual ones, and so it is important that users be taught how to properly use them.
Two kinds of electric juicers are on the market:
Masticating juicers these chew up the entire piece of food before, or in order to, squeeze juice from the inside. When the food becomes mangled, the juice naturally flows out. Masticating juicers can break fibers in food, so they have a much wider use than centrifugal juicers.
By the way, electric juicers and blender are different in function and purpose. Electric (masticating) juicers are able to separate the juice from fibers, whereas blenders, like centrifugal and manual juicers, cannot.
The theory is that since fast-moving mechanical parts of an electric juicer blow air into the food, causing greater and quicker oxidation to important nutrients, electric juicers, especially those having variable speeds, are considered to be of higher quality than manual juicers. This has not been proven, although it is a common belief.