Hi car8857,
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 meaningful comparisons between mattresses but it will come down to testing for suitability (PPP), checking for durability (making sure you know the quality of the materials inside any mattress you are seriously considering), and then comparing your finalists for “value” based on all the parts of your personal value equation that are most important to you.
If you follow the steps in the tutorial post one at a time then you will have the best possible chance of success.
One of the most effective “shortcuts” that can help cut through much of the confusion when you are buying a mattress is to focus on finding and dealing with knowledgeable and experienced retailers and/or manufacturers that have your best interests at heart (and aren’t just interested in selling you anything that they can convince you to buy). These are the ones that already know what you would otherwise need to learn and understand the importance of choosing a mattress that is a good “match” for you and knowing what is inside any mattress that you are considering. They can provide you with the type of information and guidance that can help you make the best possible choice. Who you choose to deal with can be one of the most important parts of a successful mattress purchase.
Phoenix