Hi scottlewisis,
I don’t have any personal experience with either mattress so my knowledge is limited to the specs and quality of both mattresses which are on their website (and are within the minimum guidelines here I would suggest). There is also more about the different ways that one mattress can “match” another one in post #9 here.
Softness and firmness is very subjective and two people can have very different descriptions and perceptions of the same mattress … especially with memory foam which changes firmness based on temperature, humidity, and the amount of time the memory foam is compressed … but a forum search on Dreamfoam Supreme 12 (you can just click this) will bring up more information and feedback about it from several forum members. Some people have said that it’s just a little firmer than the equivalent Cloud Supreme although as I mentioned this can be very subjective.
Outside of testing a mattress in person … the best way to choose a mattress that has the highest odds of success would be with a more detailed conversation with an online retailer or manufacturer that has your best interests at heart and they will generally know more about their mattresses and how they compare to other mainstream mattresses like the Tempurpedic “on average” than anyone else (see mattress firmness/comfort levels in post #2 here).
Phoenix