Hi aitta3,
Comfort and pressure point relief are the parts of mattress research that you will need to do (either with personal testing or more detailed conversations with a manufacturer) because I don’t know all the “comfort specs” of each mattress, I can’t feel what you feel on a mattress, and I have no personal experience with any of these mattresses (see mattress firmness/comfort levels in post #2 here). A knowledgeable manufacturer or retailer that has your best interests at heart is always the best source of guidance about comfort or support choices when you can’t test a mattress in person because they know more about their mattresses and which ones have the best chance of fitting different body types, sleeping styles, and preferences based on “averages” than anyone else.
In terms of durability post #4 here has the information I would need about each mattress to make any meaningful comments or identify any potential weak links in any of the mattresses.
1) The Cloudcroft 12"
I would want to know the density of the 2" supersoft foam but if it’s 1.8 lbs density or higher (which I believe it is) then there would be no obvious weak links in this mattress.
2) Rendezvous 14" ( is this to high for an adjustable frame)
I would want to know the density of the 2" supersoft foam and the 1.5" convoluted foam but if they are also both 1.8 lb density or higher (which I believe they are) then there would be no obvious weak links in this mattress either. Because of the thickness of the mattress and the firmness or “stiffness” of the polyfoam base layer this may not work as well or conform as well to an adjustable bed so I would make sure you ask about this because they will know more about the specific properties of all the materials and how well it will work on an adjustable.
The 9" Talalay natural latex
There are no weak links in this mattress and because it’s all latex it would likely be the most durable of the 3. The thickness of the mattress has more to do with how the mattress will feel (along with the type of latex and the firmness of each latex layer) than it does with durability or longevity. A 6 inch mattress and a 12" mattress can both last just as long as each other if the materials are the same (there is more about the factors that can affect the relative durability of a mattress in post #4 here).
Phoenix