[cm3]

The difference between Ubuntu and the two variants you mentioned is solely on the application layer and as long as they don't use the buggy KDE5 connection manager applet, WiFi won't be affected by Xubuntu or Lubuntu. So this boils down to preferences of desktop environments. I've always wondered why, instead of full distros, these variants weren't just supported more officially as flavors to choose or change to. Yes, you can install lubuntu-desktop from inside a stock Ubuntu install, but there's always some configuration and setup that's missing.