Who is "we"? You're talking about brands aimed at enterprise customers. I have no idea how much penetration Ubiquiti has managed to make into that market, but certainly around these parts its products are better known in the tier below that. The kind of organisation that is considering Ubiquiti IME probably wants significantly more functionality and scalability than home or entry-level small office gear but isn't working at enterprise scale and doesn't want to pay for it either. That organisation is unlikely to be considering the kinds of brands you mentioned as alternatives, and I rarely see any of those brands mentioned in discussions about alternatives to Ubiquiti.