Hi PAFred,
Spindle uses 100% natural continuous pour Dunlop and Cozy Pure organic comfort zone mattresses use organic molded Dunlop and both of them are very high quality and durable materials. The Spindle mattress also has a design that is somewhat similar to the Savvy Rest while Cozy Pure uses a different design that has different layering options and some more specialized materials and components in their mattress. Their zoning configuration is also different as well. Both of them would certainly be great quality/value choices even though they are very different.
If organic latex isn’t important to you then Cozy Pure also has their Natural Comfort Zone here which also uses 9" of 100% natural Dunlop and has “mild zoning” built into the wool quilted cover (instead of in the latex core) and which is also quilted on both sides of the mattress.
There is also more about the different types and blends of latex in post #6 here.
Just for reference … Flobeds also has a vZone mattress that includes custom zoning options that may be of interest as well.
When you are down to finalists that are all choices between “good and good” (which you are) and none of them have any lower quality materials or “weak links” in their design (which they don’t) and if there are no clear winners between them then you are in the fortunate position that either of them would likely be a good 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.
Phoenix