Hi Pierce,
The first place I would start your research is the mattress shopping tutorial here which includes all the basic information, steps, and guidelines that can help you make the best possible choice … and perhaps most importantly know how and why to avoid the worst ones including all the mattresses you listed or any mattress that uses lower quality or “unknown” materials (see the guidelines here) or that doesn’t provide the information you need to make an informed choice (see this article).
Two of the most important links in the tutorial that I would especially make sure you read are post #2 here which has more about the different ways to choose a suitable mattress (either locally or online) that is the best “match” for you in terms of “comfort” and PPP (Posture and alignment, Pressure relief, and Personal preferences) that can help you assess and minimize the risks of making a choice that doesn’t turn out as well as you hoped for and post #13 here which has more about the most important parts of the “value” of a mattress purchase which can help you make more meaningful quality/value comparisons between mattresses in terms of suitability (how well you will sleep), durability (how long you will sleep well), and the overall value of a mattress compared to your other finalists (based on all the parts of your personal value equation that are most important to you).
There is more information in post #9 here about the different ways that one mattress can “match” or “approximate” another one but every layer and component in a mattress (including the cover) will affect the feel and performance of every other layer and component and the mattress “as a whole” and unless you are able to find out all the specifications of a mattress you are trying to “match” (which you won’t be able to with the mattresses you listed) and then are able to find another mattress that uses exactly the same materials, components, and design (which would be very unlikely even if you knew the specifications of the mattresses that you were trying to “match”) then there really isn’t a way to match one mattress to another one based on specifications. Mattress manufacturers also generally try to differentiate their mattress from the mattresses made by other manufacturers and don’t normally try to “match” another mattress that is made by a different manufacturer so it’s also unlikely that you will find another mattress that is specifically designed to “match” or “approximate” one of the mattresses you mentioned in terms of how it “feels” or in terms of PPP.
That doesn’t mean that there aren’t other mattresses that would be just as good or even better in terms of “comfort” and PPP and there would certainly be many mattresses that used the same or better quality and more durable materials … only that they will use different combinations of materials and may not have the same “feel” or exactly the same design and you may prefer one type of mattress over others. Different people can also have very different opinions about how two mattresses compare because of differences in their body weight, sleeping style, or individual circumstances and sensitivities that will affect their experiences on the same mattress so the only way to know how two mattresses compare “for you” in terms of comfort or PPP will be based on your own careful testing or personal experience … regardless of how they may “feel” or compare for anyone else.
In general … it’s usually best to avoid testing mattresses where you aren’t able to find out the type and quality of the materials and components inside it because most of the time you spend testing them will end up being wasted since it certainly wouldn’t be a good idea to purchase them and because you won’t have any meaningful information about the mattresses you tested you also won’t be able to use your testing to help you choose a different mattress.
Phoenix