Parchment paper is mostly a commodity, the real differences are pre-cut sheets versus rolls, coating quality, and whether it's bleached or unbleached. Pre-cut half-sheet-pan sizes save waste and the fumbling with a curling roll mid-bake.
Some links below are Amazon affiliate links. If you buy through them we may earn a small commission, at no extra cost to you. See our affiliate disclosure.
Reynolds Kitchens
The grocery-store standard for a reason, reliable non-stick release and a built-in cutter box. It's bleached paper, if you specifically want unbleached you'll need one of the alternatives here.
Katbite
Pre-cut to half-sheet-pan size, no more curling-roll fights or trimming to fit. A popular Amazon-native brand rather than a legacy supermarket name, quality is solid but less of a known quantity than Reynolds.
If You Care
Chlorine-free, unbleached, and FSC-certified for anyone avoiding bleached paper products around food. It costs more per sheet than Reynolds, purely a preference purchase if bleaching doesn't concern you.
King Arthur Baking
From a baking brand bakers already trust, precut sheets sized for standard half sheet pans. You're paying a small premium for the name versus a generic precut sheet of similar spec.
Beyond Gourmet
Another unbleached roll option with good non-stick performance, mainly differs from If You Care on width and roll length. Skip it if you've already settled on a brand above, they solve the same problem.