Hi Nii,
Just in case you haven’t read it yet … the first place I would start your research is the tutorial post here which has the basic information, steps, and guidelines that can help you find the best possible choice … and know how to avoid the worst ones.
I talked to them this morning and they do make 2 sided mattresses and are probably the closest option to you for a two sided mattress that I’m aware of.
The Denver list is here but I don’t keep a record of the specific mattresses carried by each store (it would be more than anyone could keep up with in a constantly changing market). While most of them probably don’t … I would check their websites or call them to see if any of them do.
As you will read in the tutorial post and some of the links it includes (such as this article) … I would avoid the major brands or any mattress where you aren’t able to find out the quality of the materials inside it. Without knowing this information (see this article) … it’s not possible to make any meaningful comments about a specific mattress, identify any weak links in its construction, or make meaningful comparisons to other mattresses.
The most important part of the value of any mattress is how well it matches your specific needs and preferences in terms of PPP (Posture and alignment, Pressure relief, and Personal preferences). Once you have tested a mattress for PPP then the next most important part of the “value” of a mattress is the quality of the materials inside it. While you would need to know the specifics of two mattresses you are comparing … in general terms the OMF mattresses would be higher quality than Serta and most importantly they will disclose all the information you need about what is inside all their mattresses.
The better options and possibilities I’m aware of in the Pittsburgh area are listed in post #2 here.
There isn’t any way to answer this because there are too many different definitions of “best” and it would depend on which type of mattress you prefer, 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. In general terms there are many smaller independent manufacturers across the country that still make high quality two sided mattresses that would be well worth considering if you were in their area but the only way to compare or assess them would be based on the criteria that are most important to you.
There are some great quality and value one sided mattresses that use very durable materials that may be a great match for you and would also make good quality and value choices. There are always tradeoffs between different mattress designs where each choice can have it’s own pros and cons. There is more in post #3 here about the pros and cons of two sided mattresses and while a two sided mattress will be more durable than the same mattress that uses the same materials and components in a one sided design … it may not be more durable than a one sided mattress that uses higher quality materials.
You can read an analysis of the Saatva mattresses and their marketing claims in this post and a forum search on Saatva (you can just click this) will bring up more information about them as well.
Phoenix