The Bottom LineSapira is a hybrid mattress with a durable build. It offers superior comfort, support, and cooling. Casper Wave is an all-foam structure with better motion isolation. Although it has zoned support for pressure-relief, customers of different body structures and sleep styles report a comfier sleep on the Sapira, thanks to its adaptive layers and universal feel. Casper is firmer and also pricier than Sapira, which makes the Sapira an even better choice. Both mattresses can provide you a refreshing and peaceful slumber, but based on consumer reviews, Sapira is a much favorable choice for comfort, temperature regulation, and value for money.