Hi rivverrunner1,
Hopefully you’ve had the chance to read the mattress shopping tutorial here which includes all the basic information, steps, and guidelines that can help you make the best possible choice … and know how and why to avoid the worst ones.
Two of the most important links in the tutorial that I would especially make sure you’ve read are post #2 here which has more about the different ways to choose a suitable mattress (either locally or online) that is the best “match” for you in terms of PPP (Posture and alignment, Pressure relief, and Personal preferences) that can help you assess and minimize the risks of making a choice that doesn’t turn out as well as you hoped for that are involved in each of them and post #13 here which has more about the most important parts of the “value” of a mattress purchase which can help you make more meaningful quality/value comparisons between mattresses in terms of suitability, durability, and value.
The type of support material or components in a mattress would be a preference and a budget choice but not necessarily a “better/worse” choice. Innersprings and latex and polyfoam can all make suitable and durable support systems in the right firmness. There is more about innerspring support vs latex support cores in post #13 here and in post #28 here and the posts it links to.
Polyfoam is less resilient and responsive and somewhat “stiffer” and less “springy” or “bouncy” than latex (or an innerspring) but it can also make a good support system for those that are also a little more restricted in terms of their budget or for those that prefer how it feels over other types of support materials or components. There is also more about an all latex mattress vs a latex/polyfoam hybrid in post #2 here.
Most of the “feel” of a mattress when you first lie on it comes from the upper layers but the deeper layers will also contribute to how a mattress feels as well especially when you move or “bounce” on the mattress and the mattress is compressed more deeply. There are hundreds of different types of innersprings with different firmness levels and response curves that are used in conjunction with hundreds of different combinations of materials on top of them so there isn’t a single “feel” for innerspring mattresses that you can use to compare them to other mattresses because these types of comparisons depend on the specifics of the design. The same is true for mattresses that use polyfoam or latex support cores so the only way to know how two mattresses compare and the differences you would feel between them (which may not be the same as someone else would feel if they compare the same mattresses) would be based on your own careful testing and personal experience.
As long as the quality and durability of the support core meets the durability guidelines here … I would choose between them based on careful testing and based on your preferences and budget and what you can actually “feel” on the mattress “as a whole” when you test them rather than on a predisposition towards thinking that one is necessarily “better” than the other.
While it’s not possible to quantify the sleeping temperature of a mattress for any particular person or know for certain how two mattresses will compare in terms of temperature regulation because there are so many variables involved and there is no standardized testing for this … there is also more about the many variables that can affect the sleeping temperature of a mattress in post #2 here that can help you choose the types of materials and components that are most likely to keep you in a comfortable temperature range.
In very general terms the upper layers and materials of a mattress or sleeping system that are closer to your body (including the mattress cover and quilting, your mattress protector, and the sheets and bedding you use and what you wear to bed) will have a bigger effect on sleeping temperature than the deeper layers or components of a mattress and while it’s unlikely that most people would have temperature regulation issues with a latex comfort layer regardless of the materials or components underneath it … “in theory” an innerspring would have more airflow and so it could be a little more temperature regulating in some mattress designs even though I doubt that most people would notice much difference if the upper layers that were closer to your body were the same.
You are very fortunate to live in Arizona because you have some great quality/value options available to you including several of the members of this site 
Phoenix