The tuft and needle mattress is more firm and feels like 6.5/10. While the Casper mattress is not very hard and feels like 6/10. The Casper mattress might feel softer or firmer depending upon your sleeping position because of its zoned construction. While the Tuft and Needle mattress is fully firm. I think Casper mattress is best suitable for back and stomach sleepers as it provides support to the hips and they don’t sink in too far!
The zoned construction adds extra support to the lumber area also. Moreover sleeping on side gives support under shoulder area and is also great for relieving pressure.
The Tuft and Needle mattress is also a good option for back sleepers as the adaptive foam provides support just the right amount, but in case of providing support to the body Casper mattress is recommended. For stomach sleepers Tuft and Needle mattress is best because it is firm and the person does not sink into the mattress.
Both mattresses have the same balanced foam feel. They are bouncy and responsive, so you shouldn’t feel stuck in the mattress. In case of Casper mattress the person may feel firmer or softer, depending upon their sleeping position, because of its zoned construction feature.