I put La Bella 750N tapes on my jazz bass last night and so far I am very pleased with them. I was originally going to get the 760N set but I wasn't too keen on potentially having to widen the nut slots.
I've also used ETB92 tapes in the past, and i thought they were alright, but I think I prefer the La Bellas now that I've tried them.
Now I'm curious to try the white and copper tapes...
The story of tapes on my fretless jazz so far:
Based on the good things I had read from some folks on here about the D'Addario ETB92s on fretless, I put some on my bass and, once I swapped out the stock pickups with a set that improved the clarity of the bass's tone, I found that I liked the strings very well ... except that the G string sounded too thin and tinny to me.
So again, based on what I'd read on here, I tried a set of LaBella coppers, which were said to have a warm tone with a brightness somewhere in between their blacks and whites. And they are pretty nice and warm, but don't have as much definition and clarity as the ETB92s. However ... the G string sounds better. So I put the ETB92 E/A/D back on, but left the Copper G, and the tonal balance of that combination was very nice. Unfortunately, because there isn't much steel at the core of the coppers, they're pretty low output, so even though the tonal balance was great, the volume balance was not, and that couldn't be fixed with pickup height without adversely affecting the D string, in particular. So I ended up ordering a single new ETB92 G string to assess whether my original copy may have been defective, and while it's still a little thin, it's better than the first one, and I'm hoping it warms up a little more after being on the bass for a while.
The only other strings I've had on this bass were flats (TIs and Sadowskys), and overall I think I like the ETB92s more with regard to both tone and feel. But I may experiment with some rounds. I've got a set of Sunbeams to try, and if I like them, they may turn out to be a gateway drug to the TI jazz rounds, but we'll see.