Hi chadb97,
Latex in general is very point elastic (contours well to the shape of the body) and is “good” in terms of motion transfer but not as good as memory foam which is the most motion isolating of all the foam materials. Motion transfer is also a function of how all the layers and components in a mattress and the cover interact together with the people sleeping on the mattress so even mattresses that have similar materials can be somewhat different in terms of motion transfer. Different people with different body types or sleeping styles or sensitivities can also affect motion transfer. I doubt that there would be many members here that have compared their soft and firm mattresses (and even if they had their experience may be different from yours) so a conversation with Brooklyn Bedding would probably be the best source of guidance about how their soft and firm options compare in terms of motion transfer.
“Support” is often misunderstood because the goal of a “supportive” mattress is to keep the spine and joints in good alignment and this requires the type of contouring support that allows some parts of the body to sink in more and some parts of the body to sink in less and this will vary on an individual basis. There is more about primary or “deep” support and secondary or “surface” support and their relationship to firmness and pressure relief and the “roles” of different layers in a mattress in post #2 here and in post #4 here that may also be helpful in clarifying the difference between “support/alignment” and “comfort/pressure relief” and “feel” and how they interact together.
The only reliable way to know for certain whether any mattress is a good “match” for you in terms of PPP will be based on your own personal experience.
Phoenix