That raises the question as to how you could objectively compare something like stiffness/pliability. So many things come into play with this, as neck relief, string height, etc.. will all add/remove stiffness. And we're not even getting into the variables of the person playing the bass, and how they approach it.
I'd be happy with all of the manufacturers publishing the tension (pulling weight) of their strings. It's getting there, but is still not a priority for many. Of course, that would mean all of the companies that don't make their own would have to either rely on the manufacturer of them, or destroy some of their inventory in order to weigh it.