Hi dmartin1910,
The choice of materials is a personal preference and some people prefer memory foam over latex as well as the other way around. One of the most important reasons to test different materials is so you have a reference point for which types of mattress you prefer. You may also be able to find a mattress that uses a combination of thinner layers of memory foam and latex in the upper layers which would have a “feel” that was a combination of both (a fast response material over a slower response material or the other way around).
There is more about the different ways that one mattress can “match” another one in post #9 here. Since “feel” is subjective and relative to the perceptions of each person and the most difficult part of a mattress to duplicate or approximate … when you are making an online purchase this would be one part of a more detailed conversation before a purchase. It would also be a good reason to make sure you are clear about any options you may have after a purchase to exchange either a mattress or individual layers or that the manufacturer or retailer has a good return policy if the “feel” of a mattress is most important to you and is significantly different from what you are comfortable with.
Some of the better options and possibilities I’m aware of in the Atlanta area are listed in post #2 here.
Phoenix