Hi lavishxlife,
You are certainly looking at some great quality/value choices and all of them are members of this site which means that I think highly of all of them and that I believe they all compete well with the best in the industry in terms of their quality, value, service, and transparency. The differences between them will really come down to a combination of which types of latex layers you prefer (100% natural Dunlop, certified organic Dunlop, blended Talalay, or 100% natural Talalay) along with any differences between their return/exchange policies, their prices for “apples to apples” comparisons using the same type and blend of latex, and any of the other criteria that are important to you. Other than this … they all have a very similar design. There is more about the different types and blends of latex in post #6 here.
There is also more about the different ways to choose a suitable mattress (either locally or online) that is the best “match” for you in terms of PPP in post #2 here that can help you assess and minimize the risks of making a choice that doesn’t turn out as well as you hoped for once you actually sleep on your mattress. but when you can’t test a mattress in person then the most reliable source of guidance is always a more detailed phone conversation with a knowledgeable and experienced retailer or manufacturer (which all of them are) that has your best interests at heart and who can help “talk you through” the specifics of their mattresses and the options they have available that may be the best “match” for you based on the information you provide them, any local testing you have done or mattresses you have slept on and liked that they are familiar with, and the “averages” of other customers that are similar to you. They will know more about “matching” their specific mattress designs to different body types, sleeping positions, and preferences (or to other mattresses that they are familiar with such as Savvy Rest) than anyone else.
This is likely out of a concern for durability since two soft layers will be less durable than firmer layers but when you talk with them on the phone you can always ask them to confirm this.
When you are down to finalists that are all choices between “good and good” (which you are) and none of them have any weak links or lower quality materials in their design (which they don’t) 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 local testing or mattresses you have slept well on, your more detailed conversations with each of them, your confidence about the suitability of each one, their prices, your preferences, the options you have after a purchase to change the firmness or exchange or return the mattress or individual layers, 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