Hi Nemix,
While both of these are good quality materials … all else being equal I would give the advantage to the synthetic latex (latex in general is the most durable of all the foam materials).
Comfort and feel are subjective so it would depend on which one your testing indicates you prefer. All the layers and components of a mattress (including the cover) will also affect all the other layers and components in the mattress and the mattress as a whole so which one is a better match for you in terms of PPP will also depend on all the specifics of the mattress.
While it’s not possible to quantify the sleeping temperature of a mattress for any particular person with any real accuracy because there are so many variables involved including the type of mattress protector and the sheets and bedding that you use (which in many cases can have just as significant an effect on temperature as the type of foam in a mattress), the temperature and humidity of your room, the firmness of the mattress, and on where you are in the “oven to iceberg” range … latex in general is more breathable than other types of foam materials but most people wouldn’t have temperature regulation issues on either one.
There is more about the many variables that can affect the sleeping temperature of a mattress or sleeping system in post #2 here.
Phoenix