Hi BGfalcon,
You are certainly looking at some good quality and value options but most of your choices will come down to preference issues or a matter of which one is a better match for you in terms of PPP.
There is more about the most important parts of the “value” of a mattress purchase in post #13 here.
The choice between memory foam and latex is a preference choice that only you can decide (just like any preference) but there is more in post #2 here that along with your own experience may be helpful.
Your own testing and personal experience is the only way to know which of the choices you are considering is the best “match” for you in terms of PPP (see mattress firmness/comfort levels in post #2 here).
In terms of durability … all of the OMF options you are considering use high quality materials and there are no weak links in any of them but I would give the durability edge to a two sided latex hybrid over a one sided memory foam mattress.
I can’t make any meaningful comments about any of the Country Bedding choices unless I know the specifics of the mattress that you are considering there (or that they would build for you).
The first step in getting down to a single finalist at OMF (step 4 in the tutorial post) would be to choose between memory foam and latex. If your preference is latex then your finalist at OMF would be the two sided latex mattress that they offer (assuming that you are confident that it’s a good match for you in terms of PPP based on your testing).
If your preference is memory foam then the choice between the two memory foam mattresses at OMF would be primarily a matter of which one of the two your testing indicates is the best match for you in terms of PPP. If you really can’t tell the difference between them (which would be unusual because they have a different firmness level) and you are confident that either one would be a good match for you then I would choose the firmer of the two because you can always make a mattress that is too firm softer by adding a topper but it’s much more difficult to make a mattress that is too soft any firmer without removing and replacing the layers that are too soft (or exchanging for the firmer mattress).
I would follow a similar process with the mattresses at Country Bedding to narrow your finalist there down to one that you are confident is a good match for you in terms of PPP and that you have confirmed uses high quality materials and has no weak links in the design.
Once you are down to a single finalist at both then you will be comparing “good vs good” and you will be in a good position to make a final choice between them (see post #2 here) based on all the objective, subjective, and intangible parts of your personal value equation that are most important to you.
Phoenix