Hi moopad,
There is more about the most important parts of the “value” of a mattress purchase in post #13 here which can help you make more meaningful quality/value comparisons between mattresses in terms of suitability (how well you will sleep), durability (how long you will sleep well), and the overall value of a mattress compared to your other finalists (based on all the parts of your personal value equation that are most important to you).
Both mattresses have a similar support core (1.8 lb polyfoam) so your choice would really come down to whether you would prefer the “feel” of the high performance polyfoam in the Tuft & Needle (see posts #2 and #6 here) or you prefer the more resilient “feel” of the latex in the Dreamfoam Ultimate Dreams. Since this is strictly a preference choice your own local experience would be the only way to know which type of materials you tend to prefer and some people may prefer one and some people may prefer the other.
Other considerations outside of any differences in price may be that you have the option to choose a firmness level in the Ultimate Dreams Latex while there is only a single firmness level with the Tuft & Needle and that the Tuft & Needle has a 100 day return policy with free returns while the Ultimate Dreams latex has a 45 day return policy and returns cost $99.
I would also keep in mind that you are the only one that can feel what you feel on a mattress and different people can have very different opinions about the type of mattresses they prefer so I would also be very cautious about about using other people’s experiences or reviews on a mattress (either positive or negative) as a reliable source of information or guidance about how you will feel on the same mattress or how suitable a mattress may be for you and in many if not most cases they can be more misleading than helpful because a mattress that would be a perfect choice for one person or even a larger group of people may be completely unsuitable for someone else to sleep on (see post #13 here).
You are certainly looking at two good quality/value options and once you are confident that both of them would be a good match for you in terms of PPP (or you have good options after a purchase if you aren’t) and that there are no lower quality materials or weak links in any of them in terms of durability (which there aren’t) then you would be down to finalists that are comparing “good to good”. If there are no clear winners between them at this point (which is usually a good indication that you have done some good research) then you are in the fortunate position that any of them would likely make a good quality/value 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 PPP and the suitability of each one, their prices, your preferences, the options you have after a purchase to fine tune the mattress 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. Sometimes the final choice may even come down to a matter of “gut feel” or “educated best judgement”.
The TMU discount for Tuft & Needle and their 100 day return policy only applies to mattresses that are purchased directly from the Tuft & Needle site.
The TMU pillow bonus only applies to mattresses that are either purchased from Amazon and are fulfilled by Dreamfoam (not fulfilled by Amazon) and their 45 day return policy only applies to mattresses that are purchased from the Dreamfoam site. Purchases from the Dreamfoam site also have an additional 10% discount as well.
There is more about different types of support systems that are generally most suitable for different types of mattresses in post #1 here and any of the options there (or other similar options) would be suitable for either mattress although support systems that have a larger load bearing surface area and less “gaps” for the mattress to sink into over time would generally be better over the longer term but are also more costly.
Some of the information in this topic which discusses foundations/bedframes for another mattress would also be relevant to either of the mattresses you are considering and may also be helpful as well.
Phoenix