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So who would win in a fight, a Sisters of Battle force or an Adeptus Mechanicus force? Keep in mind that in this scenario, there are no superheavies and no allies, so no Inquisitor forces, Titans, Ordinatus machines, etc, just SoB vehicles and troops vs Mechanicum troops and vehicles (ie, Skitarii).
I don't think the AM really fight pitched battles in any way.. Either they're acting as supporting troops in a Titan Legion or its an exploratory fleet whose primary purpose is to scout and record new worlds rather than kick ass and take names.
Assuming a pitched battle though without superheavies, I'd say the AM loses. The Adeptus Mechanicus, in serious warfare, is focused on its superheavy weapons. Ground troops are an aside.