I've tried D'Addario, Elixir, Rotosound, Adagio (UK), Dunlop, and DR Strings. None of them sounded great, and all of these had a low B that sounded "meh".
I even tried Dunlop's Paolo Gregoletto (Trivium) signature set, which I'm pretty sure Paolo himself used on his Warwicks before he moved to Kiesel. Unfortunately, those Dunlops also sounded meh for me.
Until I tried these Warwick strings.
Every single string had a stupidly aggressive growl - INCLUDING THE LOW B.
I have since purchased 6 more, which should last me a good while. I will not be spending any money on any other brand of strings for my Warwick Thumb anymore.
Bear in mind these Black Labels are almost half the price of the other aformentioned brands.
Now if only Warwick would make coated strings so they last longer!