All three pads are designed to provide superior levels of comfort for larger rugs that do not need a non-slip rug pad. Cloud Comfort (memory foam) is going to be your most comfortable but will also be the most expensive. SpillTech is for the specialty buyer who wants to add cushion while preventing spills and stains from reaching their floors (ex. pet owners). Eco Plush offers premium levels of comfort at varying thickness levels, allowing you to choose how much cushion you prefer.