Welcome back. I'm starting up my shop again after quite some time too. Definitely feels good to be back into it.
Re: the Neopixel. Pros and cons just like everything else. Pro is the brightness and truly amazing blade effects you get.
Con vs LED Star is the power draw and runtime. A double strand looks like it will be pulling 5A+, which means either more batteries or shorter runtime. Also, with that kind of amperage, I've had to start looking at ratings for gauges and wire I'm using and if my other components all can play together nice with that kind of power. So increases complexity, or at least intentionality, there more than usual.
Different smokes for different folks really.
Plus, gotta define what you want out of your saber too. Never a lack of innovation around here though. That's for sure.