From what I understand the Snow max uses lower density 2.5pcf memory foam, then has a couple of what are imo gimmicky cooling features such as graphite infused foam and phase change materials. It is a hybrid though and has air channels through the foam to allow heat to dissipate, so it still might not sleep especially hot. Then the Tempur adapt is their entry level mattress. It will have a polyfoam core instead of pocketed coils(unless you mean the adapt hybrid) and the memory foam Tempur uses will be a bit denser and higher quality. Especially once you start looking at their pro and luxe line of mattresses. I feel like Tempur overcharges quite a bit for what you are getting, but at least with them you know you're getting decent materials. The casper snow is also pretty expensive for what you are getting as well I would say. One downside to the all foam Tempur is it will likely build up heat much more than the Casper snow hybrid would. I would trust the durability of the Tempur more though. Another option Id like to throw out there, there is a company called Tempflow who makes mattresses to compete with TempurPedic. What I like about them is they are transparent about the materials in their mattresses, you know you will be getting nice high density foams and that they havent been decreasing the quality over the years like so many others have. What I dislike is the lack of feedback. This is a company that has been around for like 20 years and there is very little customer feedback online. You can find a few mentions on Reddit, a little bit more on The mattress underground, but thats really about it. Another option which I think is a great deal for the price, If you have an Original mattress Factory by where you live they sell the Serenity and Serenity Plush . This mattress has a super dense memory foam comfort layer, much more so than modern Tempur's even. 2" of 8lb memory foam, then 3" of 5lb memory foam, and a 2.25lb polyurethane foam base. imo if want to go Tempur Adapt and dont want their higher end mattresses. Look at the Costco models . With these you get Costco's return policy, which is basically they will take it back no questions asked, no return fees, no exchange only policy or sleep trials. Answer from Encouragedissent on reddit.com