no favorites...there really is very little difference, unless you want those coated/treated strings**, which I don't use [I would if I lived closer to the beach], and there really are only a handful of actual string manufacturing plants. So I like* Fender [not Bullets], D'Addario, Martin, EB Slinkys,, S.I.T. [are they still around?], D'Arco...Rotosound, La Bella, D'Angelico/De Merle...
Basically I buy bulk packs on sale, so whoever has the best deal when I'm getting low becomes my favorite for the day.
Gauge-wise it depends which instrument, I keep .011, .010 and .009 sets for the electrics...I like light gauge on acoustics because I am antiquated.
*just reading off the labels in my 'stockpile'
** I have a couple of sets of Cleartones which I have yet to use....freebies from somewhere, maybe a winter NAMM show?
let's see...rock, blues, swing, jazz*, folk*, country, cowboy, Great American Songbook...
I play finger-style and with a plectrum, depending...
*I have combined these into my own stylistic fusion, I call it 'Jolk'