I have used a lot of strings though the years. My favourites used to be the original Fenders in the 70's and early 80's (before the bullets). The new Fenders are not the same strings as the old ones (despite the 'Original' name!). I used to run a music shop in Bingley and we started to sell Vinci Strings. I used those for many years and liked them a lot, but then they got harder to find, so I changed to D'Addarios. I then tried Scalar (these are now Snake Oil), which I really liked, but they are expensive (they are original forumla nickel). Their bass strings are the best I ever used .
John Pearse strings are very good, but hard to find.
I have also tried Dr Duck's, but I prefer the D'Addarios.
At this point I buy the D'Addario bulk sets (25 sets for $60).
I know lots of people love them, but I was never fond of Ernie Balls, I always found them really bright for the first couple of days and then dull after that.