The moment I notice a faucet is always the same one: hands full of dishes, trying to nudge the handle with my wrist because it's gone three in the afternoon and you haven't stopped since six that morning. That's when you find out if the thing you bought was worth the extra forty dollars for the single lever over the double handle, or whether you're standing there fighting a stiff knob with a soapy elbow. A good faucet disappears into the routine. A bad one reminds you about itself every single day.
Finish matters more than most people think before they're standing in a hardware aisle staring at eleven versions of the same shape. Brushed nickel and matte black hide water spots best, which counts for a lot if you've got well water or just don't want to be wiping the faucet down after every use. Polished chrome looks sharp on day one but shows every fingerprint and drip, so if you've got kids or anyone who waters the counter on the way to washing hands, think twice. Where a faucet goes wrong is reach and height for the actual sink you have, not the one in the showroom. A tall gooseneck looks wonderful over a deep farmhouse sink and useless over a shallow bathroom basin, where it just sends water bouncing off the bottom and onto the floor and your shirt. Low profile faucets suit small vanities but will have you hunched over washing a stockpot in the kitchen.
It clashes hardest with mismatched metals nearby, a gold faucet next to chrome drawer pulls looks like two different decades had an argument in your kitchen, so pick one metal tone and stick with it across faucet, handles, and light fixtures in that room. It also fights with a sink that's already got too much going on, a patterned basin or a busy tile backsplash wants a plain faucet, not another shape competing for attention.
Measuring matters more than color in the end. Check your existing hole spacing before you fall for anything, most kitchen sinks want a single hole or three holes at eight inches apart, and bathroom sinks are often four inches center to center, so bring a tape measure or you'll be returning a beautiful faucet that physically will not sit on your counter. Leave enough clearance behind the spout to fit your largest pot under it, and make sure the handle doesn't bang into the backsplash or a window ledge when it's turned all the way. Buy for the sink you have, not the one you're hoping to install someday.