Cook's Illustrated's EQUIPMENT CORNER: Cookie Sheets

We ran 11 cookie sheets of varying colors, gauges, and materials
through a battery of tests. Each of the top performers, with the
exception of the Mirro, had a shiny, silver baking surface without a
nonstick coating. The rest of the pack, including the second-place Mirro,
were nonstick, with dark-colored baking surfaces ranging from light
matte gray to black. As a group, the darker nonstick pans produced
darker brown--often too dark--baked goods. The $10 Mirro differed
because its baking surface was by far the lightest in color of all the
nonsticks, and its bottom surface was even lighter. Our top performer,
the Kaiser, was also the cheapest at $7.