Well... it pretty much depends on what you like/want/need to play on that bass - or any bass, for that matter. I have flats on all but 2 of my 23 basses - many different kinds and gauges of flats. since I have no real need for a "versatile" bass, most of mine are more or less a "One Trick Pony". But, several of them are versatile - by default, more than anything else. Those tend to have lighter gauge flats; a couple of them wear Fender 9050Ls for that reason - and, because I just like them...I should have that style bass soon and am wondering "out loud" about strings.
Any experiences to share? Ideas?
Did John Paul Jones play a Tele on "Immigrant Song"? Was he using Roto66?
I could go flats or rounds. I'm open minded on this one.
For "Old School Thump"? La Bella DTF's - 45-105 or so - pretty much define that tone. And, they're on one of my basses. I also have very light gauge DTF's on a couple of Danelectros; for "that Dano Sound". But, I like my "OST" a little more... nuanced, maybe?.. than DTF's can give me. Several basses wear GHS Precision Flats for that reason. Particularly my '78 Fender P. I put Roto RS77LDs on it originally, and it wore those for several years. I liked them, but... not quite the sound I wanted. They were followed by a set of La Bella 760FLs. After a few years, they moved on to a different bass; they were close to what I wanted, but... no cigar. Tried a set of the Fender 9050Ls, but they weren't what I wanted from the P-Bass, either. I finally realized that what I wanted from the P-Bass, was what it would have sounded like in about 1959 - with it's original Squier-made factory flats, and the mute in the bridge cover. Since GHS Precision Flats are about as close to those strings as you can get? That's what it's worn for the last few years. And, now I'm happy...
So, the flats you choose - if you do want flats - will depend on what you want to hear from that bass. And, take it from a guy who's played all kinds of flats for the last 50+ years; they do not all sound the same. Which is why I currently have 13 different kinds and gauges of flats, on 21 different basses...
And, if you're curious about TI Jazz Flats? I have them on one of my basses - an Alembic Epic. For what I play, and how I play it, on that bass? They're marvelous strings. But, I have no intention of ever putting them on any of my other basses. They would work - sort of - for what I play on those basses, but... not well. If you're curious about how they'd sound? Try some Fender 9050Ls. They aren't quite as flexible as the TI's are, and they don't have quite the harmonics the TI's do - but, IME, they're awfully close. A whole lot less expensive, too...

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