Hi sidarapd,
TMASC is one of the members of this site and are among the most knowledgeable retailers in the industry. They are experts in the mattresses they sell and the materials inside them and will provide you with accurate and reliable information about the benefits and features of all their mattresses.
There is more about the many variables that can affect temperature regulation in post #2 here but the Sleeptek, the Vimala, and the Vincence are all 100% natural Dunlop latex mattresses with cotton covers quilted with natural fiber (wool in the Sleeptek and wool/silk in the Green Sleep) which are very temperature regulating materials so it would be very unlikely that most people would have any temperature issues on any of these mattresses.
All of these mattresses use similar materials and 100% natural Dunlop latex is among the most durable materials in the industry so there are no lower quality materials or weak links that would be subject to premature impressions over the course of time. Thicker layers of wool in a cover will compress to some degree in the areas you normally sleep but with wool (unlike foam layers) this won’t affect comfort or support and it will also even out over time. There is more about the many variables that can affect the durability and useful life of a mattress relative to different people in post #4 here but latex mattresses are well known for their durability and are among the most durable mattresses in the industry. One of the advantages of a component mattress is also that if one of the layers softens or breaks down before the others (usually a softer layer on top) then you can replace the individual layer without having to replace the other layers or the entire mattress.
Natural or organic Latex and natural or organic fibers are certainly great options for those who wish to avoid synthetic materials in their mattresses either for reasons of safety of because they are greener and more eco friendly. The Sleeptek mattresses use 100% natural Dunlop that is certified organic and the Green Sleep uses 100% natural Dunlop. There is more about GOLS certified organic Dunlop latex and some of the other types and blends of latex in post #6 here.
The main difference between them would be the difference in their designs. The Vimala uses a 2" firm layer on the bottom, a 4" layer in the middle that you can customize for firmness on each side of the mattress in the middle and then a top 2" layer of extra soft on top. The Vicence uses three 3" layers with a firm layer on the bottom, your choice for each side of soft, medium, or firm in the middle and then a top layer of extra soft on top. They both use the same materials so they would be equally durable so the biggest difference and the way I would choose between them would be based on which of the three different firmness levels for each of them your careful testing indicated was the best “match” for both of you in terms of comfort and PPP (Posture and alignment, Pressure relief, and Personal preferences). The different designs and firmness options with each of them would result in a different balance between comfort/pressure relief and support/alignment so one of them may be more suitable for some people’s needs and preferences while the other would be more suitable for the needs and preferences of others depending on their body type, their sleeping positions, and their individual preferences.
Phoenix