I'm still running the same setup (Dahua NVR5216-4KS2 and several IPC-HDW5442T-ZE)What did you end up with? I have the same question - with one addition. My system will be completely local - no internet access so viewing takes place on site but using phone, tablet. Did you find a NVR you are comfortable with?
I am considering Ubiquiti's platform as they finally opened it up to ONVIF support. UniFi Camera Security - Ubiquiti
It's something to consider as more features are added. The lack of internet may still be workable in a LAN setup - but you'd need to occasionally connect to update.
In another post here - this comment sums it up:
"In (Unifi Protect) you have a ready to use hardware/software platform with a very cool and easy to use mobile app and a mega nice web interface - two areas where neither HIK/Dahua nor BI are impressive..."