Strings are truly love/hate with me. I love trying new ones but hate to have to remember what is on what bass. I know that color of the ball ends or wrap is the best way to differentiate but I forget what's what.
I'm using flats on a new P-bass and I LOVE them. I think they are Ernie Balls but could be D'Addario. I've used TI, DR, GHS, Dunlop, and more. I just bought a set of GHS Balanced Nickels as I definitely prefer nickel over stainless. Beyond that, I'm all over the map. So, looking forward to hearing your success/fail stories with strings.
I'm still looking for the right strings for my Kilotons. Maybe I'll put flats on one and rounds on the other. Too many strings!!
I’m all over the place with strings, too. Tend to be gravitating more toward flats lately.
My ‘89 L2k is currently wearing Chromes. Got the setup just right and they sound great. I get the most compliments on my tone with this one.
My ‘88 L1k is wearing LaBella LTFs, mainly because I wanted low tension strings for the sake of the neck. I prefer the feel of the Chromes on the L2k, but I prefer the sound on the L1k just slightly. A little deeper and fuller, where the Chromes have more punch and definition in the mids.
My LB-100 has Fender 9050 flats. I had them on a ‘00 L2k for a while, and really liked them. Similar to the Chromes, maybe a little less in the mids, though.
That ‘00 L2k eventually went through DR Sunbeams and Fat Beams, with my preference toward the latter. Also tried the Fat Beams on the ‘88 L1k and really liked them, but only took them off for the sake of tension on the neck. I’ve also used Fat Beams on a L2500, though the B string wasn’t my favorite.
I preferred nickel rounds on my M2500 when I had it. Dunlop Super Brights, if I remember. Easy playing strings with a somewhat neutral tone. Similar to D’Addario XLs, but with a little more clarity on the lower strings. And cheap.
I played Rotosound RS66s on an SB-2 for years. Real raw, gnarly tone, especially with a pick. Not easily tamed.
Other strings I tend to use are DR Low Riders. Have ‘em on one of those 2013-14 Gibson EBs with the double buckers and they sound great. Also use them on P basses fairly regularly.