Hi Wahoo,
You can see my thoughts about the pros and cons of an all latex mattresses and latex/polyfoam hybrids and a mattress like the Alexis which is “in the middle” of the two because of the extra layer of latex in post #2 here along with post #2 here which it also links to.
Post #2 here also includes some links to posts and topics which may help in your choice between them.
As you can see … I would personally lean towards thicker or multiple layers of latex vs a single layer with higher weights if your budget allows it.
Phoenix