Hi Royce,
The best mattress for back pain depends on your individual circumstances as each person has different needs in a mattress to keep their spine in a natural alignment in all their sleeping positions.
There is a thread about back pain here https://forum.mattressunderground.com/t/what-type-of-mattress-do-you-recommend-foro-back-pain with a few suggestions and if you could provide a little more information about your own sleeping positions and weight distribution, I would certainly be happy to give a few more specific suggestions that may help you as well.
Welcome to the Mattress Forum!
Phoenix