Hi jayl65,
Just in case you haven’t read it yet … post #1 here has the basic information, steps, and guidelines and links to some of the more important forum posts that can help you make the best possible choices.
Both memory foam in higher densities (5 lbs and above) and latex are durable materials although the edge would generally go to latex in terms of durability. The choice between them is a matter of personal preference.
Higher weights will generally need different designs compared to people who are lighter and a greater emphasis on more durable materials and firmer support and comfort layers are the “norm” for higher weights. You can read about the factors that can affect the useful life of a mattress in post #4 here. Most good retailers or manufacturers are familiar with “average” needs and preferences for heavier customers and will change their suggestions accordingly.
Some of the better options I’m aware of in your general area are listed in the Albuquerque list in post #5 here and your own testing and experiences (and of course research for the things you can’t “feel”) are really the only way to decide which materials or type of mattress you prefer.
Phoenix