Dahua must have improved their software. I was trying every brand of camera about 8 years ago when I setup my system. The first Dahua I bought required their ActiveX component for Internet Explorer to see the camera output from their web interface!
I agree that Dahua looked better but at the time their web interface was so bad I kept the Hikvisions.








100 mb Ethernet can be run over cat 5e, Cat 6, etc. You can even have Ethernet frames running over coax. (Not just the original standard which was coax but there are modern bridges for using cable TV coax in your house to reach rooms where you can’t pull cat5.)