Hi azetab,
The Ultimate Dreams Eurotop has a 1.5 lb polyfoam quilting layer and then 3" of blended Talalay latex and a 2 lb polyfoam base layer so there are also no lower quality materials or weak links in this mattress that would be a reason for concern in any weight range either.
Post #2 here has more information about how the Dreamfoam Ultimate Dreams Eurotop and the Brooklyn Bedding BestMattressEver compare and may also be helpful.
The choice between different types and blends of latex would be more of a preference and budget choice than a better/worse choice. Any type or blend of latex is a high quality and durable material and wouldn’t be a weak link in a mattress but in general terms latex that includes a higher percentage of natural rubber would be more costly than latex that includes a higher percentage of synthetic rubber. There is more about the different types and blends of latex in post #6 here.
The most important parts of the “value” of a mattress (in order of importance) are ,
-
How well you will sleep on it (suitability)
-
How long you will sleep well (durability)
-
How it compares to the other mattresses you are considering based on suitability, durability, and all the other parts of your personal value equation that are most important to you
Phoenix