Hi scion78,
I don’t have any personal experience with either mattress but there is more about the most important parts of the “value” of a mattress purchase in post #13 here that may be helpful. There is also more about some of the pros and cons of buying from Costco in post #4 here.
Outside of PPP (Posture and alignment, Pressure relief, and Personal preferences) … the most important part of a mattress purchase is the quality and durability of the materials inside it but unfortunately the pictures you listed don’t provide any information about the quality of the materials in these mattresses so it’s really not possible to make any meaningful comments about the mattress, identify any weak links in the design, or make meaningful comparisons with other mattresses.
If you can provide the information listed here I’d certainly be happy to make some comments about the quality of the materials in either mattress and let you know if I can see any obvious weak links in the design.
I would ask Costco to find out the information for you because they may have better results than you since other forum members haven’t been successful in finding out the information they needed directly from Paramount (see post #2 here and the posts it links to about Paramount).
If you aren’t able to find out the information you need to make an informed choice I would pass the mattress by.
Phoenix