Not sure if UA can do it or not, but the ability to drop to 0 is pretty amazing. My vote is NK if you truly view FL and TX as equal. Plus they offer bases in each (DFW, FLL, MCO) and FL will get you a solid QOL quicker than anywhere I've seen. Interviewed 2020BC (before Covid) and that was the happiest group of part-time employees I've ever met. All on 50+ days off racing to see who could fly the least by the end of the year. If you're wanting time with family, I would recommend NK all day.