Neither product is universally "better," as they serve different needs: James Hardie is made of fiber cement, offering superior fire resistance, impact strength against severe hail, and exceptional resistance to rotting or pests. CertainTeed primarily manufactures high-end vinyl and polymer siding, which is more affordable, lighter, and lower-maintenance since it never requires repainting. Hardie wins on durability and realism, while CertainTeed wins on budget and ease of upkeep.
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