Hi Pspa123,
There is no “right” answer for this because it depends on your circumstances, criteria, and preferences and also depends on whether you sleep alone or with someone else that was fairly different from you in body type or sleeping style (as in your case) where a thicker mattress can be designed to be more adaptable to the different needs and preferences of different people. While I don’t think you are in the weight range that “needs” more than 9" of latex or so (assuming the design is “right” for you) … you may well prefer it in your circumstances. You can read more about some of the potential benefits of thicker mattresses in post #14 here. You can also read a little more about different ways that can accommodate two people who may be quite different in their needs and preferences in the first part of post #2 here.
Phoenix