Hi Pspa123,
There is more about how 100% natural Talalay compares to blended Talalay in post #2 here.
I wouldn’t consider any type or blend of latex to be a weak link in a mattress relative to other types of foam but if you are looking at the softest versions of Talalay 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 their blended Talalay vs their 100% natural Talalay. With Radium Talalay I would consider them to be closely comparable although any softer version of any material including latex will be less durable than a firmer version of the same material.
Phoenix