Hi Neko,
10 minutes is better than the testing that many people do when they purchase a mattress but it’s still a little bit too short … especially for a memory foam mattress which may need a little more time for the foam to soften with your body heat. I would make sure that you use the testing guidelines in the mattress shopping tutorial … especially if you have some special “challenges” that can make choosing a mattress that is the best “match” for you in terms of PPP (Posture and alignment, Pressure relief, and Personal preferences) a little bit more difficult.
There is more about the different ways that one mattress can “match” another one in post #9 here but it’s unlikely that another manufacturer would make a mattress that was designed to match either one of these or have exactly the same layers so unless a manufacturer or retailer is personally familiar with how their mattresses compare to a specific mattress you have tested or a mattress description specifically mentions that a mattress is designed to be a close approximation of a specific mattress you have tested the only way to find a mattress that would perform or feel similar to you would be based on your own careful testing and experience (although this would be a more subjective comparison).
Both of these mattresses are also mattresses that I would tend to avoid, since they don’t disclose the quality of the materials inside them and they both use lower quality materials than I would be comfortable with (see the guidelines here). I wouldn’t spend any time testing mattresses where you aren’t able to find out the specifics of what is inside them (see this article). There would almost certainly be other mattresses in lower budget ranges that would feel similar to you, that use higher quality materials, and/or are more transparent about the quality of the materials inside them.
The mattress shopping tutorial includes a link to a list of some of the better online memory foam options I’m aware of (in the optional online step) and if you let me know your city or zip code I’d also be happy to let you now about any of the better options or possibilities I’m aware of in your area.
Yes … pressure relief and alignment are opposites in many ways. Thicker/softer comfort layers (or materials that can contour to the shape of your body more effectively) can improve pressure relief because they can provide a deeper pressure relieving cradle that can redistribute your weight over a larger surface area and reduce pressure points … they can also “allow” the heavier parts of your body to sink in more deeply before they are “stopped” by the firmer support layers that are deeper in the mattress and there is a higher risk of alignment issues with softer mattresses. There is more about primary and secondary support and their relationship to pressure relief in post #2 here and post #4 here. In very general terms … it’s usually less risky to choose a mattress that provides “just enough” pressure relief in all your sleeping positions so that there is less risk of experiencing the back pain and discomfort that can come from sleeping on a mattress that doesn’t keep you in good alignment over the course of the night.
Phoenix