My experience is that, as a general rule, the higher silver content bass strings have a richer and harmonically purer sound. They tend to last longer.
Savarez Cantiga, for example, are probably the closest to a high silver content string there is amongst the ‘normal’ strings.
Given pricing and performance for me the standout bass strings are:
Cantiga (regular silver, see above)
Knobloch Double Silver
Pyramid Sterling Silver
I just can’t see the value in Knobloch Sterling or La Bella Argento. More so, I don’t particularly like the Argento. Nice tone but they sacrifice weight and power for purity. At that price, I want it all not a trade off.