Hi killowatt59,
The materials in the OSO would generally be durable enough for your BMI. The support layer is a 6" 2 lb polyfoam core, with the 3" Dreamcell latex configuration embedded into it near the shoulder area (or hip/thigh area if the mattress is rotated). Above this is 1.5" of 2 lb polyfoam and this is topped with 1.5" of Talalay latex. OSO doesn’t list any weight restrictions for their mattress. OSO is a member here of the site, which means that I believe that they compete well with the best in the industry . They also have a 101 night sleep trial, should your purchase not turn out as well as you had expected.
While I’ve linked to this information to you previously in my replies…Assuming that the materials in a mattress you are considering are durable enough for your body type and meet the quality/durability guidelines here relative to your weight range, the choice between different types and combinations of materials and components or different types of mattresses are more of a preference and a budget choice than a “better/worse” choice (see this article ). There is more information in post #3 here and the posts it links to that would be helpful for those that are in higher weight ranges
Phoenix