I can't give you technical reasons, all I know is that, after years of trying different brands (Rotosound, Ernie Ball, D'Addario) the first time I tried a set of their strings my P-bass sounded exactly like I thought it should. I haven't looked back since. I'm still digging D'Addario strings on my Sire, but I'm keen to try Newtone strings on it at some point. They aren't the cheapest but they certainly aren't outrageously priced, and I'm happy to pay a little extra to support a British company that makes a quality product.