Whether ACX or CDX plywood is better depends entirely on the intended application, because they are engineered for different purposes. ACX plywood features an A-grade face veneer that is smooth, sanded, and free of major flaws, making it ideal for visible projects like shelving, cabinets, or exterior siding where appearance matters. CDX plywood features lower-grade C and D veneers with knots and rough patches, but it utilizes the same exterior waterproof glue and is optimized for structural strength behind walls or under roofing. Therefore, ACX is better for appearance, whereas CDX is better for hidden structural strength.
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