Hi get2venkat,
Dreamfoam (AKA Brooklyn bedding) is one of the members of this site which means that I think very highly of them and that I believe they are among the best of the best in the country. They are fully transparent about the materials they use, knowledgeable about mattresses and materials, and have great quality and value.
They are also an actual mattress manufacturer who does more than just assemble mattresses and like many of the members here are known by other manufacturers and people I respect in the industry.
Latex is a higher performance material than polyfoam (not just more durable) and much more costly as well and an all latex mattress will carry a significantly higher price than a latex/polyfoam hybrid… Post #2 here and the other posts it links to talk about the differences between an all latex mattress and a latex polyfoam hybrid and may help you decide whether the differences and the cost tradeoff is worth it to you. In the end only your own experience (and perhaps local testing on both types of mattress so you can feel the differences for yourself) can help you know for certain. It would depend completely on what was most important to you and on your own personal “value equation”.
Tempurpedic is just “regular” memory foam and my thoughts about their materials are the same as any other memory foam of the same quality and density. Different versions of memory foam will also have different properties as well and you can also read more about this in post #8 here as well as post #9 here. Of course Tempurpedic like most major manufacturers has poor value but at least many of their mattresses (but not all) use good quality materials. You can see my thoughts about the pros and cons of memory foam (incuding Tempurpedic) in this article and the pros and cons of latex in this article. They are very different materials and the choice between memory foam and latex is very much another personal preference and should be based on your experience in testing good quality versions of both to see which you prefer. You can also see more of my thoughts about Tempurpedic in post #2 here.
Phoenix