So until recently, I've had D'Addario Chromes on my Squier Precision V (5-string, Jazz electronics, Precision body) and I've enjoyed the sound; Chromes, after all, are my favorite bass string.
I decided to try rounds again. I bought a set of Ernie Ball Slinky Bass 45-130 and installed them. They sound "cool" when solo, of course, but in a mix, they're getting lost. The director of the worship band I'm in (two guitars, keys, drums, bass, three vocalists) pointed out yesterday that when I go up past the 7th fret on the D-string, the bass disappears. It's true! I really wanted to love rounds again, but I miss the beef of flats

The thing is, I'm not in love with the Chromes B-string. However, that very well may be entirely due to the lackluster pickups Fender sent these basses out with.
I think for my next set of strings, I'll look at different brands of flats. Fender and Rotosound have my eye, at the moment. There's just no denying the presence of flatwounds when played in a mix!