I generally prefer nickel plated, round core rounds (like DR Sunbeams or Pure Blues), so pretty mellow for rounds, but I really don't like them brand new when they are too zingy IMO/IME.
My regular player is a Lull M4V (usually in passive mode) with very old (4 years ?) Pure Blues rounds. It's right in between the round wound/flat wound sound ... perfect, as long as they will tune/intonate ok.
Also, I think of all my instruments as tools for specific applications, so while I prefer rounds, I do have a bass with flats for that kind of sound.
My regular player is a Lull M4V (usually in passive mode) with very old (4 years ?) Pure Blues rounds. It's right in between the round wound/flat wound sound ... perfect, as long as they will tune/intonate ok.
Also, I think of all my instruments as tools for specific applications, so while I prefer rounds, I do have a bass with flats for that kind of sound.