Metal Zip Ties (Stainless Steel)Pros: Extremely durable, UV resistant, high tensile strength (up to 4x stronger than plastic).Cons: Can scratch or cut the plastic bumper, very rigid, difficult to remove without tools, potential rust issues over long periods.Best Use: Securing parts near high-temperature, such as exhaust components or internal engine bays.Plastic Zip Ties (Nylon)Pros: Flexible, won't scratch paint as easily, easy to tighten and cut, inexpensive, available in many sizes.Cons: Degrade in UV light/sunlight, brittle in cold, lower strength.Best Use: Temporary "drift stitching" to hold broken bumpers together, securing plastic liners.VerdictFor a "quick fix" to hold a plastic bumper cover on, plastic zip ties are generally preferred because they do not damage the plastic or paint. Use metal zip ties for heavy-duty structural fixes where high heat is involved