I'm going to jump in here. I have recently gotten onto the flat wound band wagon and I love them.

Before that I was very much a dead round wound person. I had a box full of second hand strings so that I had already dead strings that I could put on my basses if one broke - I hate the sound of new strings and particularly one new string on an already strung bass sounded awful. That doesn't mean I don't like treble - I like a consistent, non zingy tone that will remain the same whether I change strings or not.

PS. I have worked hard at getting the tone I want, I have a good half dozen effects pedals that I use regularly. The basses themselves I don't use for tone shaping (one bass I never touch the controls, another the controls are bypassed).