An electric chopper is the fastest way to mince an onion, and the Ninja Express Chop (NJ110GR)is the one to beat: one touch, a couple of pulses, done. The four picks here all spin a blade to the same end — the differences are bowl size, how nicely they are built, and price.
What an electric chopper is (and is not) for
Onions, garlic, shallots, herbs, nuts, a coarse salsa or pesto — the everyday small jobs that do not justify hauling out a full processor. A spinning blade minces; it does not slice, shred or dice into cubes. If you want a uniform dice, that is a job for a push-dicer from the manual roundup, not any bladed chopper. Within its lane, though, an electric chopper is the least-effort tool in the kitchen.
One caveat on the numbers: chopper wattage is not worth chasing. These motors run for a second or two at a time, so a 200-watt bowl and a 250-watt one feel much the same on an onion. Buy on bowl size and how the thing is built, not on the watt figure on the box.
Which electric chopper for which cook
Buy the Ninja Express Chop (NJ110GR) for the best mix of price, speed and easy cleanup on small batches. Step up to the Cuisinart Elite 4-Cup Chopper/Grinder (CH-4DC) when a 2-cup bowl is too small and you want to chop a real pile at once, or grind spices and nuts with its reversible blade. The KitchenAid 3.5-Cup Food Chopper (KFC3516) is the nicely-built option, with two speeds and a drizzle basin for dressings, if you do not mind paying for the finish. And the Hamilton Beach 3-Cup Electric Vegetable Chopperis the value entry — a real bowlful for the price of a couple of coffees, best kept to soft and medium foods rather than hard nuts every day.
How we picked
Tools we claim to have lab-tested: 0
Every site in this category tells you they ran twenty machines through a lab. We have not, and we say so. Here is what we do instead: read the manufacturer's manual and spec sheet, record the published bowl capacity, motor rating, blade and disc counts and materials, cross-check the warranty against the manufacturer's own warranty document, and cite all of it so you can check the work. Prices come live from Amazon's API and disappear rather than go stale.
The scores above are judgments from that documented research — not test results. The full rubric, including what disqualifies a product, is published in full.