Hi Mamie,
The chemical forumla of memory foam can result in many different properties of the final memory foam even if they have the same density. There is more about the differences between different types of memory foam (even if they have the same density) in post #9 here and in post #8 here. A conversation with each manufacturer will be the most accurate source of information about the memory foam that they sell.
There are also some videos here that can help you make some general comparisons between Sensus and Aerus.
BB would be the most reliable source of information about how the memory foam they sell (and they sell several different types) would compare to other types of memory foam on the market.
This may be because of the specific design of the mattress you tried. Tempurpedic has a very wide range of mattresses and some would be much more suitable for certain body types, sleeping positions, and preferences than others because of the differences in the type of memory foam each one uses and in the design of each mattress.
Phoenix