Mitsubishi Electric's air conditioner is better.
Mitsubishi Electric's compressor all their own production, domestic Mitsubishi Heavy most of the outsourcing (there is Panasonic, there is Mitsubishi Electric, there is Mitsubishi).
Mitsubishi Electric focuses on human air conditioning, in terms of comfort is much better than the Mitsubishi Heavy Industries (Mitsubishi Heavy Industries in Japan mainly produces equipment air conditioning).
Mitsubishi Electric spare parts are used in leading international brands, such as Panasonic (fan, starter, etc.), and some of their own production (Mitsubishi Heavy Industries many spare parts are used in second-tier brands, quality stability is not as good as Mitsubishi Electric). As for the quality stability of rust prevention and so on, they are more or less the same, are the international leading level.
Overall: If the domestic Mitsubishi motors on the domestic Mitsubishi Heavy Industries, it is undoubtedly Mitsubishi motors win;
If the imported Mitsubishi motors on the imported Mitsubishi Heavy Industries, it depends on the use, if the equipment with, with Mitsubishi Heavy Industries, if it is a person with, with the Mitsubishi motors. ?