Hi nzafi,
The better options and possibilities I’m aware of in and around your area (subject to the guidelines here) are listed in post #7 here.
I’m not quite sure how you mean this or how you are defining “better”. Latex cores don’t have polyfoam mixed into them when they are made but there are many mattresses that use various types of polyfoam layers in combination with various types and blends of latex in their design. I would always make sure you know the type and quality of the upper layers of a mattress which are generally the weakest link of any mattress and I would avoid mattresses that used thicker layers of lower quality/density or unknown polyfoam in the upper layers but I would be much less concerned about a mattress that used good quality polyfoam with latex comfort layers above it. Which mattress is “better” for any particular person always depends on their specific criteria but there is more about the most important parts of the “value” of a mattress purchase in post #13 here which can help you make more meaningful comparisons between mattresses.
Phoenix