We tend to switch the line and neutral with out side lights, in the main as possible to get water in them, and we don't want a neutral earth fault stopping you using other lights on the same circuit. Some times we have a neutral at the switch for in door lights, but rare to switch it, having a neutral at the electronic lights switch reduces the chance of the light flashing when switched off, electronic light switches without a neutral tend to have a minimum lamp size of 5 watts. Even when total is over 5 watts, small physical size bulbs are often missing the by-pass resistor and smoothing capacitor and can flash when off, and shimmer when on.
My switches work fine with BA22d bulbs and E14 bulbs, but some times get shimmer with GU10 bulbs, and my G9 bulbs were a nightmare. With the G9 the load capacitor stopped the flashing when off, but had to fit 6 watt LED bulbs in a package as big as the E14 candle bulbs before I stopped the shimmer, as to if capacitor still needed I don't know. Before finding the larger bulbs I cured it by using one tungsten bulb.
Hope it works out OK for you.
