Both CertainTeed and GAF represent the elite upper echelon of North American shingle manufacturing, making neither universally "better" than the other. CertainTeed Landmark series is widely praised as the gold standard for heavy-duty structural weight, density, and rich aesthetic depth. GAF Timberline HDZ is celebrated for having the largest certified contractor network in North America and innovative LayerLock technology. CertainTeed edges out slightly in physical weight, while GAF leads in contractor accessibility.
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