My experience with flats:
Flats do not sound good on any type of bass. I have flats on my PBass and they sound great but they sound terrible on my Delano pickup equiped Jazz Bass V
When playing, live you often need more highs to cut through. Especially if the room acoustic is bad. Many players record with flats and play live with rounds.
There are big differences in sound between the various flatwound strings on the market
Flats tend to sound great with a little dirt.
Flats do not sound good on any type of bass. I have flats on my PBass and they sound great but they sound terrible on my Delano pickup equiped Jazz Bass V
When playing, live you often need more highs to cut through. Especially if the room acoustic is bad. Many players record with flats and play live with rounds.
There are big differences in sound between the various flatwound strings on the market
Flats tend to sound great with a little dirt.