Battery powered vs. alway plugged in:
For our kitchen it adds an extra hassle of suddenly not working and needing to be charged. For somewhere without any power options that you don't use frequently it would be a nice option.
Motion vs. on/off switch:
This is something that sounds ideal, but is fussy and erratic in practice. It may or may not turn on, and when it does turn on there’s only 3 options for how long it stays on (15, 60, 120 seconds), none of which typically match what you want. Part of this is to conserve battery, but also how would you signal turning it off? Using motion to turn off would mean false triggers and more frustration.
That being said it’s easy to remove battery and run off USB power, could also wire a remote on/off switch. That or jettison the whole board (use for somewhere that makes more sense) and wire the lights up like the other string with simple usb power and switch.