Hi deb38,
The choice between 100% natural Dunlop and Talalay is a matter of personal preference. They are both very high quality versions of latex. They both come in a range of firmness levels but have a different “feel”. You can see some of the differences between the different types of latex in post #6 here and a little more about the difference in how they “feel” in post #7 here. The Essence has a Dunlop base and Dunlop tends to be a little more supportive and firmer than Talalay in the same ILD and it has 100% natural talalay in the top layer for a comfort layer. The Total latex mattress is all blended Talalay.
You can probably test the difference between 100% natural Dunlop and 100% natural Talalay or even a combination with 6" of Dunlop and the top 3" of 100% natural Talalay (which is similar to blended Talalay) at Clean Bedroom because the Savvy Rest has options for both.
Phoenix