The answer to this question is simple as it is really the incorrect question to ask. The better question is which is better for the planned application as there are pro’s and con’s for both. SPC is the newer technology, but it is not necessarily better in a broad sense. The core determines which product is best suited for the application.
SPC core is Generally 80% Limestone 20% PVC polymer and is not “foamed” therefore has a higher core density, creating a more solid underfoot feel.
WPC is Generally 50% Limestone 50% PVC polymer w/expanded polymer core creates a more comfortable under foot feel.
The next thing to consider when purchasing a WPC or SPC floor is the attached pad or underlayment which are added by the manufacturer to improve sound abatement and under foot comfort. There are three main categories of underlayment.
Cork – All Natural, Sustainable, naturally contains SUBERIN (soo-BER-in) a waxy substance that resists mold and mildew, maintains gauge and acoustical integrity for the life of the floor.
EVA – Ethylene Vinyl Acetate is an elastomeric polymer that produces materials which are “rubber-like” in softness and flexibility. EVA can be found in many consumer products such as Flip Flops, Pool Noodles, Croc’s and Underlayment for floating floors. EVA tends to lose its loft and acoustical properties over the life of the product.
IXPE – Irradiated Cross-Linked Polyethylene, is a closed-cell foam that is 100% waterproof, and impervious to mildew, mold, rot, and bacteria. Offers superior acoustical ratings. Can be glued.