Hi ONUV,
The first place to start your research is the tutorial post here which has all the information, steps, and guidelines that you will need to make the best possible choices.
One of the links there is mattress firmness/comfort levels in post #2 here which talks about the only two ways I know to make a mattress choice based either on your own personal testing for PPP or with more detailed conversations with a manufacturer or retailer that sells mattresses to consumers online and can use “averages” to help you make the best choice out of the options they offer.
Dutch Craft has some good quality and value mattresses available but they are wholesaler and don’t deal directly with the public outside of letting you know the closest retailer to you so you can test their mattresses to see which one is the best match for you in terms of PPP and the parts of your personal value equation that are most important to you.
Phoenix