Hi debating.
There really isn’t any way for me to know for certain without seeing the specifics of any lab testing results on either the materials in the mattress or the complete mattress which generally aren’t available.
The only reliable way to assess the “safety” of a material in more general terms is based on any certifications they have for harmful substances and VOC’s and while for most people a CertiPUR certification (for memory foam or polyfoam) would be “safe enough” … it’s also possible that even with a certification some people may have a specific sensitivity to certain materials that for most people would be fine (some people with MCS or multiple chemical sensitivities for example may react to materials that the large majority of people would be fine with).
In very general terms and based only on anecdotal and “non scientific” information and “reports” you will find that of the three main foam materials memory foam will have the highest incidence of people that have complaints about “symptoms” they they experience followed by polyfoam followed by latex. There are also many people that are more concerned about sensitivities and “chemicals” in a mattress that tend to choose mattresses that contain more natural or even organic materials just to err on the side of caution.
I wouldn’t put much credence in the information that you are given at most larger chain stores.
Again … there is more information about the 3 most important parts of “value” of a mattress purchase in post #13 here which can help you make more meaningful quality/value comparisons between mattresses in terms of suitability (how well you will sleep), durability (how long you will sleep well), and the overall value of a mattress compared to your other finalists based on suitability, durability, and all the other parts of your personal value equation that are most important to you (including the price of course and the options you have available after a purchase if your choice doesn’t turn out as well as you hoped for).
If you are defining “better” in terms of the quality and durability of a mattress then the only way to make these types of comparisons between specific mattresses is based on comparing the specifics of the materials inside them but the major brands in general tend to use lower quality and less durable materials that would be a weak link in their mattress.
The only “all latex” mattress at Sleep Country that would be “somewhat” comparable to one of the Renelle all latex mattresses would be the NaturaOrganics Eco Balance.
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Phoenix