Hi suema,
You can see the pros and cons of each of them in post #13 here.
A soft/medium/firm layering would be fairly “standard” for someone in your weight range based on averages but not everyone falls inside the averages and the most reliable source of guidance about which layering combination would be best for you would always be a more detailed conversation with a knowledgeable and experienced manufacturer or retailer that has your best interests at heart. They will know more about which of the options they have available would have the best chance of success for any particular person than anyone else.
There is also more about the different ways to choose a mattress (either locally or online) that is the most suitable “match” for your specific needs and preferences (or to another mattress) and how to identify and minimize the risks of making a choice that doesn’t turn out as well as you hoped for that are involved in each of them in post #2 here.
There is also more about the differences between Dunlop and Talalay in post #7 here but the choice between them would be more of a preference choice than a “better/worse” choice. I would treat them as close equivalents in terms of durability and choose the type and blend of latex that you tend to prefer.
You are certainly looking at some very good quality options. Once you are down to finalists that are all choices between “good and good” and none of them have any obvious weak links or lower quality materials in their design and if there are no clear winners between them then you are in the fortunate position that any of them would likely be a suitable choice and post #2 here can help you make a final choice based on your material preferences, your conversations with each of them, their prices, the return/exchange options they have, any additional extras that are part of each purchase, and on “informed best judgement” based on all the other objective, subjective, and intangible parts of your personal value equation that are most important to you.
Phoenix