IMO, strings make a big difference. Over the years I’ve become pretty familiar with 4 different brands, and what to expect from them tonally, surface feel, string tension, and lifespan.
I used to “tailor” the sound of my basses by which brand of strings I put on them. For instance, back when I wanted my basses to sound bright, I used D’Addario XLs, because they had the brightest sound, and they stayed bright sounding the longest. My Alembics and Spectors sounded too bright, so I used GHS Bass Boomers on them. Bass Boomers are the least bright sounding strings that I use, and I found that they made my Spectors and Alembics sound slightly warmer.
I bought an EBMM U.S. made Sterling, which came with EB Hybrid Slinkys. I experimented with my favorite brands, and I found that it sounded it’s best using Hybrid Slinkys.
For the last several years I’ve been using a fatter sound, with a lot less high end, so I’ve been using GHS Bass Boomers on most of my basses.
I use GHS Pressurewounds on one of my main basses. The sound of these strings match up perfectly with what I want from it.
And I use Rotosound Swing Bass 66’s on my P-Bass. I feel the sound of SB66’s on a P-Bass is a very iconic Rock bass tone.