Hi pungo,
The choice between different types and blends of latex is more of a preference and budget choice rather than a “better/worse” choice and any type or blend of latex will be a durable material relative to other types of foam materials. There is more about all the different types and blends of latex in post #6 here and there is more about how 100% natural Talalay compares to blended Talalay in post #2 here.
In terms of how they feel … some people would be able to tell the difference between blended Talalay and 100% natural Talalay and some people wouldn’t. It would be more likely that you would feel a difference if all the layers in a mattress were either one material or the other rather than just a single layer of each.
The bottom line is that I wouldn’t consider any type or blend of latex to be a weak link in a mattress but if you are looking at the softest versions of latex (with an ILD in the teens) and if the latex comes from Talalay Global then I would give the edge in terms of durability to blended Talalay vs 100% natural Talalay. With Radium Talalay I would consider them to be closely comparable although any softer version of any material will be less durable than a firmer version of the same material.
Phoenix