Hi Dcg,
I would treat this as a preference choice not a “better worse” choice. While latex would tend to be more durable than an innerspring “in theory” … in practical terms the weak link of a mattress is normally in the comfort layers not the support core of a mattress regardless of whether it’s an innerspring, polyfoam, or latex. There is more detailed information about latex vs innerspring support cores in post #2 here but this may be more technical than you need to know and I would make a choice based on which one was a better match for you in terms of PPP or the other parts of your personal value equation that are most important to you (including the price and the options you have available exchange or return a mattress or individual layers after a purchase).
Again in theory yes because an innerspring allows for more airflow than any foam material (including latex) but the layers that are closer to your body will have more effect on the sleeping temperature of a mattress than the deeper layers in a mattress so in practical terms sleeping temperature will depend more on the comfort layers, the cover and quilting materials, your mattress protector, and the type of sheets and bedding you use than it will on the type of support core in the mattress. Post #2 here has more information about the many variables that can affect the sleeping temperature of a mattress.
Phoenix