Neither GOTS or GOLS is “better” than the other. They regulate different kinds of materials and thus can’t really compete with each other. GOTS tracks textiles made with organic natural fibers like wool, silk, cotton, etc. Meanwhile, GOLS only deals with products made of refined rubber. That means whether you need a GOTS or GOLS certified mattress is going to depend on whether you’re buying a natural latex foam mattress or some other kind of organic material.