Live or recording, I don’t know, maybe both if I like them. I do like my nickel Rounds, so one bass would always have them fitted. Some songs will likely sound better with flats. I know I can try flats on both basses in time, but for now will just try them on one set, I think most likely the 63 first as I prefer the maple neck when playing live. Mainly down to it been easier to see on stage. Thanks everyone for you comments.