Victorinox wins on broad everyday simplicity; Mercer wins on published edge details and a hand-wash-first routine.
These knives are close enough that the selection should be practical. Each is an 8-inch-class, stamped chef’s knife with a black, grip-oriented handle and a straight edge for the ordinary work of chopping, slicing, and dicing. Neither page needs a price comparison to explain the decision. Start with the tasks and care pattern that will occur after it comes home.
Victorinox’s selected Fibrox Extra Wide is the more complete fit for a shopper who wants a broadly useful prep knife with fewer conditions. The maker calls out an extra-wide blade, an ergonomic non-slip handle, 13.4-inch overall length, 2.2-inch width, and 6.4-ounce weight. It also lists the knife as dishwasher safe. That does not make a dishwasher the only sensible care choice; it does make Victorinox the clearer answer for someone who wants that official option available.
Mercer’s Millennia earns its place as the alternative because its official page is specific about different things: high-carbon Japanese steel, a stamped construction, a 15-degree blade angle, HRC 53–54, NSF certification, and a Santoprene-plus-polypropylene handle with raised texture and finger points. Those details suit a shopper who prefers to hand wash, dry, store, and maintain a knife deliberately. Buy the Victorinox unless Mercer’s published edge specification, NSF positioning, and tactile handle approach are the exact reason you are shopping.