Really depends on the tone an individual player is looking for. Rounds of any sort are too bright and sparkly for me on a fretless bass, but give me a set of Labella 760s or D'Addario Chromes and they give me just the right amount of brightness that I want. Both those sets also have a fullness of tone I have never heard from a set of rounds.
I'd say don't just take someone else's word for it. Experiment with different string types. It might open your eyes or even ears.