Mags pouches are for Smith and Wesson 2.0 Metal double stack mags and the handcuff case is for a ASP Hinged Model 250 WD12890399

I went ahead and ordered because of the Labor Day sale but I have a question. In regards to the light I’m not certain I understand the light head versus switches question. Please explain this to me. Which is more common? Please contact me in regards to this prior to building these two holsters.