Hi FAUguy,
I would be very cautious about considering any major brand mattress that likely uses low quality/density materials in the comfort layers (regardless of how it “feels” in a showroom) or any mattress where you don’t know the quality of the materials inside it unless the durability and useful life of a mattress and how quickly you will need to replace it isn’t an important issue for you (see the guidelines here).
A blind purchase like this is one of the most common reasons for buyers remorse much too quickly after a purchase.
There is more about the most important parts of the “value” of a mattress purchase in post #13 here that can help you make more informed choices and make more meaningful quality/value comparisons between mattresses.
Phoenix