I've used all the TI strings over the years. I like them all, but don't use the power strings. I don't remember why...
The power and superalloys are the only round-type string that has the tension and gauge similar to industry standard. The Jazz Rounds are downright floppy, and can be impossible to set up if your bridge only goes so high and your truss only goes so far to provide relief. The Flats are also low tension and can have the same problem with setup.
The Jazz rounds and Flats do last forever it seems. And there are no strings like them from anywhere else. I think of the flats as the spircore of e-bass.
The Superalloy are great, but they do die, and when they go they get rather tight and harsh. There are other strings similar from US brands- the alloy is the 52% nickel type. I like the lighter gauge, but it's only made in the XL string length and at that length, they tend to break up in my tuners.
On that note, I'm curious if anyone has tried 52% nickel strings from other makers? I just learned all of this recently and would prefer to use American companies if their 52% nickel strings have a similar tone/tension profile. La Bella 52, GHS balanced nickel, DAddario half rounds (which I haven't tried in 25+years), B52's, etc. Do these sound like