I wont use anything else but these.
Even if I was given free strings by a well known company, I don't feel anything competes with these.
I use these on both guitar and bass religiously. Sounds fresh for a long time and very durable.
My first guitar currently has Blue Steels on it and I barely pick that thing up any more but they still sound decent after a a year. For a professional player, on my main axe, I change these monthly to keep the tension.
F*** Anything else.