Hi palermo22,
The “natural” talalay is blended and the “all natural” talalay is 100% natural. It’s confusing and I think their names are misleading (and many retailers don’t know the difference or which one they have). As you can see on their site … the “natural” (which is the blended) has a 20 year warranty and the “all natural” (which is the 100% natural) has a 10 year warranty because the all natural isn’t quite as durable in the lower ILD’s (softer). The blended is also less expensive. They also talk about the difference here.
You can read more about the two different types of Talalay in post #2 here and about all the different types of latex in post #6 here.
So the choice is a preference but hopefully this will help you decide which one is best for you.
Phoenix