RGB Mosfet control. Which leg to pull to the hround
There are different schematics on the net. One pull the signal to the ground
Others the load.
So which one is better?
Practical difference: not much in the Arduino home automation world. But I prefer NPN since that's what the MySensors examples use.
Imo in all cases the pulldown should be on the controlling pin (gate). Otherwise listen to @mfalkvidd