Hi lur3nj14,
There are many factors that determine the sleeping temperature of a mattress which you can read about in post #2 here and post #29 here but as far as foam goes … latex is the most breathable and generally the most temperature regulating of all the foams. Because of that, the softness of the 13" gel memory foam mattress, and the more breathable quilting layer of polyfoam, I would probably give the advantage to the Ultimate Dreams for most people and the versions with the wool in the quilting would be more temperature regulating yet.
The Gel memory foam would be cooler to the touch because gel is thermally conductive but the cooling benefits of gel memory foam only last until temperatures equalize and the foam becomes an insulator and ventilation provides a longer lasting benefit over the course of the night.
Phoenix