Hi Jewels.
Yes, it has been quite a long journey for you but I am glad to be of assistance! 
The Nolah is comprised of:
2" 2.75 lb polyfoam
1" 4 lb Avena polyfoam
7" 1.8 lb polyfoam support core
This product would raise no “red flags” for someone in a more “normal” BMI range, but I would advise a slight caution for someone in a higher BMI range (30+).
The S&S mattress has been previously discussed in this thread here which has some clarifications from the company’s cofounder concerning the foams they use.
2" 4 lb gel memory foam
2" 1.8 lb transitional performance foam
6" 1.8 lb Polyfoam support layer
Polyester/Spandex/Silver Infused Zipper Cover
Again they don’t list the ILDs on their site but for a normal BMI range this product would meet the minimum durability guidelines here
I’d make sure to base your choice on some good local testing which will also give you a much better sense of the many different types of materials and components that are used in mattresses and some reference points about the types of mattresses (see this article) and general firmness levels you tend to prefer which can help you narrow down your choices regardless of whether you end up purchasing locally or online.
I am looking forward to learn about your eventual decision.
Phoenix