All my basses have worn flats only for the past 20 years. Recently I bought a used bass with rounds on it, and have kept those on it, because when I first owned one of those basses in the 1980s it had rounds on it, so this one felt quite familiar. Otherwise, it's flats for me - all my other basses are wearing a selection of Pyramids, TIs, Chromes and EB Flats.