For women in any surgical field, as for men in any surgical field, the time commitment required after residency is determined by you. You can work long hours if you want to get into big surgeries with complex patients or make money - you can work shorter hours and be home, too, but usually sacrifice case complexity that you will be comfortable with as well as income. The dynamics of the group you join when you finish training will also dictate what is required, too. If everyone is hard-core and working long hours, they may not be willing to accept you as a partner if you want to home each night by 5 pm and pass off work to them. Both PRS and ENT are considered more lifestyle oriented surgical specialties, but in both of our fields, there are surgeons who work 80+ hrs per week and surgeons who are <50. Call in both is relatively light. Financially, we do similarly, too. Look at the bread and butter of each field, and see which you prefer. Some people prefer to not deal with snot and ear wax, others aren't into breast reductions and ulcers. You can't go wrong with either field, and I would say that both PRS and ENT attendings are quite happy with their chosen fields.
I can tell you, that in ENT, we have seen a dramatic increase in the number of female applicants and residents, but I would guess that this is representative more of the medical student population since I see far more female residents in all surgical fields.