Good responses. I'm a 98% fretless player. Started with rounds for many yrs...then light rounds...then Chrome flats....now I've converted all my fretless and fretted to flats because... I prefer the smooth tone, long life, and no rope burn. I would start with what it comes with. After some woodshed while staring at your tuner choose what your taste dictates. I've chewed up some fretless fingerboards with rounds as well as flats so don't let that be the deciding factor. It's highly subjective...enjoy it.