Hi rmerrick,
Talalay (blended or natural) is among the most breathable of all the foam materials and generally sleeps cool for most people. Keep in mind though that there are many factors involved in the temperature regulation of a mattress besides just the foam used so even cooler sleeping foam can sleep warmer for some people depending on the combination of materials and layering (including the bedding) that is in your sleep system (see post #2 here).
Both of them also have a kind of “sweet” smell (some describe it as like sugar cookies and some as a little like vanilla among other “sweet” comparisons).
Phoenix