Six checks cover nearly every wood nosing decision. Work through them against your own floor before comparing listings, because the floor sets the answer and the retailer does not.
Check 1SpeciesMatch the floor, not just the colour. Red and white oak look alike in the rack and take stain differently, and maple and softwood need a conditioner to avoid blotching.
Check 2Thickness and floor typeSolid and engineered flooring are different thicknesses, so their nosings are rebated differently. Measure your actual floor rather than assuming.
Check 3ProfileOverlap nosing laps over the edge of the flooring; flush nosing sits level with it. They are not interchangeable on the same stair, and flush has to be planned before the floor goes down.
Check 4FinishUnfinished takes stain to match an aged floor. Prefinished saves a step but limits you to the colours offered, so check it against your floor in daylight.
Check 5Length and jointsOne piece per step reads cleanest, because a joint on a step edge shows and eventually opens. Check that the length covers your widest tread.
Check 6FixingNosing is bonded and usually fastened, never left to float, whatever the rest of the floor does. Follow your flooring manufacturer's instructions for the adhesive and fasteners.