Hi WonkyBent,
Post #13 here has more information about the most important part of the “value” of a mattress purchase that can help you make more meaningful comparisons between mattresses.
The most important question you will need to answer is “which mattress am I most likely to sleep best on?” This will either be based on your own personal testing or if you can’t test a mattress in person then a more detailed conversation on the phone (see mattress firmness/comfort levels in post #2 here). If you aren’t confident about which one would be most suitable for you then the return or exchange policies would likely become a more important part of your purchase decision so you can use your actual sleeping experience to decide whether a mattress is a good match for you in terms of PPP and lower the risk of making a choice that is “less than ideal” for you. Nothing else matters if you don’t sleep well on a mattress.
The next most important part of your choice will be “how long will I sleep well before I cross the threshold from sleeping well to sleeping OK to “tolerating” a mattress to finally deciding to replace it?” … either because the materials in the mattress have softened or broken down or because your needs and preferences have changed over time.
The Everlast uses Talalay latex and a pocket coil so there are no weak links in the mattress and being two sided it would be more durable than a similar mattress with a one sided construction (see post #3 here) even though latex is already among the most durable of all the foam materials.
The Euro Pillowtop isn’t available outside of the Phoenix area as a local purchase so since you live somewhere else then this wouldn’t be an option that is available to you.
You can see my thoughts about Saatva in post #1 here. It uses a little over 2" of 1.5 lb polyfoam in the layers above the Bonnell coil which is a less durable material than latex so while it would be a “better than average” choice compared to most mainstream mattresses … it would be a little over the edge in terms of the amount of lower quality materials that it uses than your other choices so in terms of durability I would rank it a little lower than your other latex/innerspring choices.
This would be similar to the Everlast in that it uses similar materials (a pocket coil, Talalay latex, and a cotton/wool quilted cover). The advantage here would be that if your initial purchase wasn’t the best choice for you then you would have more ways to fine tune the mattress by exchanging components or layers without having to replace the entire mattress. There are no weak links in this mattress either.
After suitability and durability then you can compare your choices based on all the other parts of your personal value equation that are most important to you. Since natural materials appear to be an important criteria … this may also eliminate the Saatva which uses both polyfoam and memory foam in the mattress which are synthetic foam materials.
Once you are down to your finalists that you have taken into account the suitability of the mattress and the durability of the mattress … and you are making a choice between “good and good” … then your final choice (see post #2 here) will really be a matter of “best judgement” based on any personal testing you have done on any of them, your conversations with each one on the phone (if you haven’t tested them in person), your budget, the options you have before and after a purchase, and on all the other objective, subjective, and intangible parts of your personal value equation that are most important to you.
It may also be worthwhile including some of the local options that are available to you as part of your research since there is also “value” in being able to test a mattress in person before you buy it so that there is less uncertainty about what a mattress will “feel like” to you.
Phoenix