Aluminum strips for roofing and siding differ in terms of gauge, finish, profile, and coating. Gauge refers to the thickness, with lower numbers indicating thicker strips, offering greater durability. Finishes can be mill finish, anodized, or painted, with painted finishes offering color options and corrosion resistance. Profiles include standing seam, batten, and ribbed, each affecting aesthetics and water runoff. Coating thickness and type, such as Kynar 500 or Hylar 5000, impact weather resistance and lifespan. These factors determine the strip's suitability for specific climates, architectural styles, and budget considerations.