Hi Boston124,
Therapedic is a licensee group (see post #2 here) so the mattresses they make and the specs of their mattresses can be different depending on which factory makes them in different areas of the country but the EcoGel memory foam is generally 4 lbs density (I would confirm this with the manufacturer to make sure they haven’t replaced it with a different density) and the “latex enhanced” polyfoam is 2 lbs density which along with the 1.8 lb density base layers and the 5 lb memory foam in the Blue Essence are all good quality materials and meet the guidelines here and if all these specs are correct there would be no lower quality materials or weak links in either mattress.
There is more about the different ways that one mattress can “match” or “approximate” another one in post #9 here but it’s very unlikely that you will find two mattresses that have exactly the same materials, components, and specs so in terms of comfort and PPP (Posture and alignment, Pressure relief, and Personal preferences) the only way to know whether another mattress was comparable would be based on your own personal testing and experience.
In terms quality and durability … the only way to make meaningful comparisons between two mattresses would be by comparing the type and quality of the materials inside both of them (see this article).
The “value” of a mattress purchase is also relative to how it compares to the other specific mattresses or “finalists” you are considering (in the same size of course and based on “mattress only” to “mattress only” comparisons) or that are available to you either locally or online and there isn’t a “formula” you can use to assess the value of a mattress because it depends on each person’s criteria which can be different from person to person. There is more about the most important parts of the “value” of a mattress in post #13 here that can help you make more meaningful comparisons between mattresses based on all the parts of your personal value equation that are most important to you.
If either mattress you are looking at compares well to your other finalists in terms of PPP and the quality/durability of the materials and all the other parts of your personal value equation that are important to you then they would certainly be well worth considering.
You may have seen this already but just in case you haven’t some of the other better options or possibilities I’m aware of in the Boston area (subject to the “value” guidelines that I linked) are listed in post #2 here.
Phoenix