Best firm mattress on the market. Pin It on Pinterest. Best Performance Mattress. Yet, online mattress brands are making it easier to find the right fit. Nolah Socially Conscious. I would consider the Purple mattress. It is not a life altering decision. Copper has been shown to potentially have some health benefits. Interested in how you like yours. However, all mattresses fall into certain categories. It combines the best of memory foam and coils into one.