Someone mentioned materials used, and I agree, metal formulations are pretty darn important.
I prefer the warmer tone of pure nickel strings, but the different brands all sound different, too!
If you hate changing strings until you absolutely need to (whether out of sheer embarrassment, or clients breathing down your neck - guilty as charged, your honor!), experimentation can feel like a PITA. But it's necessary until you find Your Preferred Thing.
Currently, My Preferred Thing is Sono-Tone pure nickel vintage strings, because they sound a tiny bit brighter than most pure nickel strings. But after all, what does 'Pure Nickel' mean, really? They're all formulations! There's nickel plate, and pure nickel, but even pure nickel ain't 100% nickel, and then there's the core geometry to contend with.
I guess that's why a personal tryout is required. As an aside, I absolutely do not advocate that anyone else on this f#cked-up earth agree with my choices in string gauge, materials, or geometry.
I'll be me, you be you. Live, and let live.
Another variable is a string's core shape; there are several kinds, and they all sound and feel a little different. As is the case with finding the right string gauge, one simply has to experiment with materials and geometries until the right thing happens by some miracle of good luck to appear on your guitar.
Once that happens, I dunno about you...I stop looking, because...why screw around with happiness? Oh, there's a different shiny object on the horizon and you want to go for it?
Be my guest, sir or madam. It's a only a few buckst. Cheap thrills!
There are expensive thrills - new guitars or amps - but new strings might be the cheapest thrills a guitar player can have, short of groupies.
"Do you still get groupies, Les?"
"We call them 'Grandma Fans' these days, my friend. Life is a very, very short ride. Yesterday you were all hot and bothered just viddy-ing these very same women. Today, well...being with them is a charitable contribution on your part, as well as on her part. She feels just as sorry for you as you do for her. It's not a perfect outcome, but such is life on this planet. However, there's an upside."
"What's the upside?"
"You're. Not. Even. Tempted. Nor. Is. She."