The first question is what the switch box holds. Some of Sonoff's switches require a neutral wire, and the S-MATE2, for example, is made precisely for the homes that do not have one. The second question is form: a touch switch mounted on the wall shows in the decor, whereas a module like the MINIR4 hides behind the old switch and leaves the traditional rocker in use. The channel count tells you how many lighting groups one device controls - the T2 EU's three channels are enough for three separate lights.
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The first question is what the switch box holds. Some of Sonoff's switches require a neutral wire, and the S-MATE2, for example, is made precisely for the homes that do not have one. The second question is form: a touch switch mounted on the wall shows in the decor, whereas a module like the MINIR4 hides behind the old switch and leaves the traditional rocker in use. The channel count tells you how many lighting groups one device controls - the T2 EU's three channels are enough for three separate lights.