Hi SuperJ,
I switched your post to a more suitable topic that has some information that may be helpful.
I don’t know of anyone that has mentioned trying both mattresses but hopefully one of the members here that has tried both of them will see your post and share their comments.
I would also keep in mind that these are very different mattresses with different types and blends of latex (which would have a different feel and response) and very different designs. The Morgongava has a single layer of latex with a single firmness while the BME uses a combination of multiple layers that will each have some affect how it feels and different people may have very different opinions about how they feel and compare based on their body type and sleeping style which will affect how deeply they sink into the mattress and their perceptions about which of the layers have a significant effect on their sleeping experience and on how firm the mattress feels to them compared to someone else.
Every layer and component in a mattress will have an effect on the feel and performance of every other layer and component above and below it and the ILD or density of latex is only one of several variables or “specs” that will determine how soft or firm an individual layer or a mattress “as a whole” will feel to different people (see post #4 here). In addition to this the ILD or density of different materials or different types and blends of latex also aren’t always directly comparable to each other (see post #6 here) so using the ILD of a particular layer or combination of layers as a reliable indication of how any mattress will “feel” or how firm it will feel to you compared to another mattress with a completely different design can be more misleading than helpful .
There are also no “standard” definitions or consensus of opinions for firmness ratings and different manufacturers can rate their mattresses very differently than others so a mattress that one manufacturer rates as being a specific firmness could be rated very differently by another manufacturer. Different people can also have very different perceptions of firmness and softness compared to others as well and a mattress that feels firm for one person can feel like “medium” for someone else or even “soft” for someone else (or vice versa) depending on their body type, sleeping style, physiology, their frame of reference based on what they are used to, and their individual sensitivity and perceptions. There are also different types of firmness and softness that different people may be sensitive to that can affect how they “rate” a mattress as well (see post #15 here) so different people can also have very different opinions on how two mattresses compare in terms of firmness and some people may rate one mattress as being firmer than another and someone else may rate them the other way around. This is all relative and very subjective and is as much an art as a science.
While your own careful testing or personal experience is the most reliable way to know whether any mattress is a good “match” for you in terms of comfort and PPP or how closely it “matches” or “approximates” another mattress … when you can’t test a mattress in person then the most reliable source of guidance is always a more detailed phone conversation with a knowledgeable and experienced retailer or manufacturer that has your best interests at heart and who can help “talk you through” the specifics of their mattresses and the properties and “feel” of the materials they are using (fast or slow response, resilience, firmness etc) and the options they have available that may be the best “match” for you based on the information you provide them, any local testing you have done or mattresses you have slept on and liked or other mattresses you are considering that they are familiar with, and the “averages” of other customers that are similar to you. They will know more about “matching” their specific mattress designs and firmness levels to different body types, sleeping positions, and preferences (or to other mattresses that they are familiar with) than anyone else.
Phoenix