Hi JDMWDC,
Just to clarify your comment here …
Polyfoam and latex both come in a wide range of densities and firmness levels but latex is a much denser material than polyfoam. With polyfoam firmness/softness is not connected with density (any density can be made in a wide range of firmness levels) but with latex firmness/softness is very closely connected with density.
I certainly agree with your comment that more latex can provide both durability and performance benefits for a mattress … especially for those that are heavier.
Besides the article that JDMWDC linked … post #2 here talks more about the differences between a latex/polyfoam hybrid and an all latex mattress and post #4 here may also be helpful.
As JDMWDC also mentioned … while the Total latex mattress has options for both the comfort and support layers … only the top layer can be exchanged after a purchase while with the Aloe Alexis you can exchange (or re-arrange) either of the top two layers after your purchase.
“Feel” is very subjective and perceptions of how closely two mattresses compare can vary from person to person. There are also different types of softness and firmness and some people are more sensitive to “support softness/firmness” than they would be to “comfort softness/firmness” but having said that the upper layers are a bigger part of what most people feel on a mattress when they lie down on it (as opposed to how they feel when they wake up where the support layers can play a bigger role) so their relative ratings for different mattresses would be fairly accurate for most people.
Phoenix