Hi KevKanos,
While the density of memory foam is the most important factor in its durability (up to about 6 lb density or so) … I would keep in mind that density isn’t directly related to the firmness or softness of memory foam and any density of memory foam can be formulated in softer or firmer versions. 5 lb memory foam can be softer than 4 lb memory foam or vice versa depending on how the memory foam is formulated. There could also be other differences in the properties of different formulations of memory foam as well (such as slower or faster response, more or less breathable, more or less temperature sensitive etc) depending on the chemical formulation of the memory foam. There is more about the different properties that can be formulated into of different types of memory foam in post #9 here and in post #8 here.
Outside of the actual firmness/softness of the upper layers of a mattress … the thickness of the upper layers and several other variables can also affect how soft or firm a mattress “feels” to different people (see post #4 here). The Ultimate Dreams Supreme 12″ most likely uses firmer memory foam and also has thinner memory foam layers than the Ultimate Dreams 13" gel memory foam mattress which is why it would be firmer. It would be closer to the firmness of the Tempurpedic Cloud Supreme while the Ultimate Dreams 13" gel memory foam mattress would be closer to the Tempurpedic Cloud Luxe.
In addition to how a mattress “feels” and how suitable it is for you in terms of PPP … I would ALSO make sure that it uses higher quality/density materials that are suitable for your weight range because this will be the single biggest factor in how long a mattress maintains the comfort and support which is the reason you initially purchased it.
In other words … the suitability of a mattress and the durability of a mattress aren’t mutually exclusive and are completely separate issues.
In its simplest form … choosing the “best possible” mattress for any particular person really comes down to first finding a few knowledgeable and transparent retailers and/or manufacturers that sell the types of mattresses that you are most interested in (either locally or online) and that you have confirmed can provide you with all the information you need to know to make an informed choice and make meaningful comparisons between mattresses and then …
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Careful testing (hopefully using the testing guidelines in the tutorial) to make sure that a mattress is a good match for you in terms of “comfort”, firmness, and PPP … and/or that you are comfortable with the options you have available to return, exchange, or “fine tune” the mattress and any costs involved if you can’t test a mattress in person or aren’t confident that your mattress is a suitable choice.
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Checking to make sure that there are no lower quality materials or weak links in the mattress relative to your weight range that could compromise the durability and useful life of the mattress.
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Comparing your finalists for “value” based on #1 and #2 and all the other parts of your personal value equation that are most important to you.
The Dreamfoam mattresses use similar or in many cases better quality foam materials compared to many memory foam mattresses that are in significantly higher budget ranges (such as Tempurpedic) and are certainly great quality/value choices but regardless of the name of the manufacturer on the label … based on “averages”, lower density foam materials (including memory foam) won’t last or maintain their comfort and support for as long as higher density versions of the same material.
Phoenix