I agree with CPTBadAss that Alps and Topre are very different switches. For starters, I’d say that Alps and Cherry switches have more in common than either does with Topre. Partly that’s because there are many varieties of Alps switches (though on new boards, those varieties pretty much come down to what you can buy from Mattias). The sound and feel on my Mattias mini quiet pro are very different from the complicated white Alps on my 25-year-old Northgate Omnikeys. There’s less variety in the Topre family. I think of Topre as a little more like a BMW (smooth, elegant, precise), and Alps as a bit more like a Buick (solid, fun, and not quite as expensive).