A Talalay latex mattress and a Dunlop latex mattress are both available as all natural latex.
The difference between them is not in the ingredients.
Rather the difference is in the manufacturing process, which creates a different product.
This alternative process for Talalay results in a slightly
different feel and quality. Whether it is better is up to you.
The Dunlop process was the original way of creating a mattress from natural rubber sap and was invented in 1929.
The sap is whipped in a centrifuge before being poured into a mold and then baked. After being whipped in the centrifuge the sap has a uniform consistency.
\However as it is being baked the natural sediments settle to the bottom. The air bubbles that create ventilation also shift and do not maintain a uniform structure.
This results in a denser mattress that is that quite consistent throughout. It is firmer and denser at the bottom.
The Talalay method was invented in the 1950s by the Talalay brothers. What they do is add an extra couple of steps to the process.
After the latex has been whipped and poured the mold is vacuum sealed. It is then flash frozen and has carbon dioxide gas added. What this does is lock the air bubbles and the sediments in place. Only then is it baked and while this happens nothing sinks like is does in the Dunlop. This results in a more consistent cell structure and a uniform feel from top to bottom.
The Talalay process is much more involved than the Dunlop process, and naturally that makes it more expensive. But is it better?
This is a controversial and subjective argument. Manufacturers tend to say whatever suits the product that they are selling. If they are selling just Talalay they will tell you that a Talalay latex mattress is far superior. If they sell both they will say there is no difference.
There is no objective test out there which says one is better than the other. This is because whenever it comes to a mattress each individual has their own needs and preferences. Some people prefer Talalay and some Dunlop based on the different feel.
Having said that based on empirical evidence it would suggest that Talalay is the superior choice. It breathes better with the more open cell structure, it is arguably better against pressure relief because it is slightly softer and is more durable.
But really there is little benefit in saying one is better or worse, they are just different. Just like you cannot say that a cotton pillow is better or worse than a wool pillow. Remember it is merely the process that is different not the product.
Dunlop foam is denser and firmer, Talalay foam is softer. So depending on your preference you should be able to make your decision based on that.
Some manufacturers like Savvy Rest let you choose layers of either type. In this case you can get the best of both worlds. Put the firmer Dunlop on the bottom for support and the softer Talalay on the top for comfort.