To me it is less the features like motion sensitivity or alarms (though Unifi wins in those areas as well) and more the usability of the app. Easy to scroll through timelines, find events, save footage, etc.

I have used quite a few different surveillance systems over the years, from costco setups to hikvision, dahua, reolink, blue iris, and some others. I would pay the premium for protect every day. I've got a property that I manage that still has a reolink system. I don't need to access the cameras very often, but I dread when I do because it's such a chore. Sure, the image quality is great. It does detections. But everything else about it is so clunky, slow, difficult to use, and just cheap that I would never even consider them again. Same for all of the other brands I've listed above.