Hi yixi,
I switched your post into a new topic of its own so that your questions and any replies don’t get mixed in with different questions in another member’s topic.
There is more about the 3 most important parts of “value” of a mattress purchase in post #13 here 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 suitability, durability, and all the other parts of your personal value equation that are most important to you).
In terms of suitability … the only way to know how two mattress that have different designs will compare in terms of PPP (Posture and alignment, Pressure relief, and your Personal preferences) would be based on your own careful testing or your personal sleeping experience. The OMF Serenity has the advantage of being able to test it in person to make sure that it’s a good match for you in terms of PPP while the SleepEZ 10000 has the advantage of being able to rearrange or exchange the layers so that if your first choice or layering combination doesn’t turn out as well as you hoped for you can fine tune the comfort and/or support of the mattress by rearranging or exchange layers.
In terms of durability … both mattresses use high quality materials and there are no lower quality materials or weak links in either of them that would reduce the durability or useful life of either mattress. The latex in the middle layer of the SleepEZ would probably be more durable than the 2.5 lb polyfoam in the middle of the Serenity but the Serenity is also a two sided mattress (see post #3 here) so they would both make very durable choices. The SleepEZ 1000o is also a component mattress which also has the advantage of being able to replace a single layer if one of the layers softens or breaks down before the others or if your needs and preferences change over time without having to replace the entire mattress.
In terms of overall “value” this would really depend on how they compared in terms of suitability and PPP along with all the other parts of your personal value equation that are most important to you. In addition to the flexibility of being able to rearrange or exchange individual layers … SleepEZ also has a very good return/refund policy if in the worst case (which would be a very small minority of people) none of the layering combinations was a good match for you. Original Mattress Factory has the advantage of being able to test in in person before a purchase but if the choice you make doesn’t turn out as well as you hoped for they only have an exchange policy (see here for the details) which allows you to exchange the mattress for a different mattress but there are higher costs involved. They also don’t have any other latex mattresses so you wouldn’t be able to exchange for a different latex mattress if you wanted to sleep on latex but the firmness level wasn’t suitable for you.
SleepEZ also has a wool quilted cover which would have an advantage in terms of temperature regulation and it also has 9" of latex rather than just the 6" of latex in the Serenity so the raw materials cost of the SleepEZ mattress would be higher than the Serenity but of course this isn’t as important as whether a mattress is a good match in terms of PPP and whether a mattress uses high quality and durable materials.
SleepEZ is also a member of this site which means that I think very highly of them and that I believe that they compete well with the best in the industry in terms of their quality, value, service, knowledge, and transparency although I also think highly of the quality and value of the OMF mattresses as well…
Once you are down to a list of finalists and you are confident that they would all be a good match for you in terms of PPP (or you have good options after a purchase if you aren’t) and that there are no lower quality materials or weak links in any of them in terms of durability (which there aren’t) then you would be down to finalists that are comparing “good to good”. If there are no clear winners between them at this point (which is usually a good indication that you have done some very good research) then you are in the fortunate position that any of them would likely make a good quality/value choice and (post #2 here) can help you make a final choice based on your local testing or mattresses you have slept well on, your more detailed conversations with each of them, your confidence about PPP and the suitability of each one, their prices, your preferences, the options you have after a purchase to fine tune the mattress or exchange or return the mattress or individual layers, any additional extras that are part of each purchase, and on “informed best judgement” based on all the other objective, subjective, and intangible parts of your personal value equation that are most important to you. Sometimes a final choice may even come down to very minor differences or can sometimes just be a matter of “gut feel” or “educated best judgement”.
Phoenix