Hi Lina,
Just in case you haven’t yet … I would make sure you’ve read the mattress shopping tutorial here which includes all the basic information, steps, and guidelines that you will need to make the best possible choice.
The choice between Talalay and Dunlop is a preference choice not a “better/worse” choice and some people will prefer one and some will prefer the other. There is more about the differences between them in post #7 here but the most reliable way to know which one you tend to prefer is based on your own personal testing.
Unfortunately … nobody else can feel what you feel on a mattress and there are too many unknowns, variables, and personal preferences involved for anyone to be able to know which mattress is “best” for you based on specs (either yours or a mattress) or theory at a distance so this part of your research will depend on your own personal testing (hopefully using the testing guidelines in the tutorial post) or your more detailed conversations with any online retailers or manufacturers you are considering (see mattress firmness/comfort levels in post #2 here).
Comfort/Pressure relief and Support/alignment are the two primary functions of a mattress but they are opposites so the key to finding the most suitable mattress that is the best match for you is to find the best balance between them. This is the main challenge for everyone that is looking for a mattress and the key is usually to find a mattress that has “just enough” pressure relief in your most pressure prone position (usually side sleeping) so that there is less risk of alignment issues in your other sleeping positions. There is more about primary support, secondary support and their relationship to pressure relief in post #4 here.
I’m not sure what you mean because they have a range of mattresses in different firmness levels using different types of materials and components but the only way to know whether any mattress is a good match for you in terms of PPP is based on your own personal testing or sleeping experience (again hopefully using the testing guidelines in the tutorial post). The one “all latex” mattress they have uses a 6" support core and a 2" comfort layer (it’s not just a 6" core) and as far as I’m aware comes in different firmness levels.
There is also more about the different ways to choose a mattress and how to minimize the risks of making an unsuitable choice with each of them in post #2 here.
The better options and possibilities I’m aware of in the New York City area (subject to the guidelines here) are listed in post #2 here.
The tutorial post also includes a link to the members here that sell mattresses online and many of these also sell latex or latex hybrid mattresses that use different types of latex with a wide range of designs, options, price ranges, and exchange and return policies that may also be worth considering if you are comfortable with the idea of an online purchase.
Phoenix