Hi AndrewR,
The choice of materials is really a personal preference so only you can decide which mattress is likely to be the best match for you in terms of PPP (Posture and alignment, Pressure relief, and Personal preferences) based either on your own personal testing or a more detailed conversation with a knowledgeable and experienced manufacturer (see mattress firmness/comfort levels in post #2 here). There is no such thing as one mattress that is “ideal” for a large percentage of the population although it may be more “OK” than “ideal” for a bigger group (although still not anywhere close to the majority of people).
I think the most important question you can ask is “why” you are considering the Casper (or any mattress) and which mattresses are you comparing it to. How do you feel either “about” or “on” the specific materials that it uses. While it may not be the “best” value from a commodity point of view (the cost of the raw materials in the mattress) compared to other mattresses in the same budget range that use more costly materials … a mattress is more than just a commodity and the value of a mattress to each person would depend on all the parts of your personal value equation that are most important to you. More than anything you may be missing the reference points from your own testing and experience that can help you decide which materials or combinations of materials you tend to prefer. Until you have some sense of what different types of materials or combinations feel like, you really won’t have any way to compare mattresses or decide on which type of mattress you may prefer so you can choose between them.
I would generally suggest following the steps in the tutorial post (including some local testing so you have some familiarity with different materials) and then choosing two or three “finalists” and then making a final choice between them.
Phoenix