Nvrs are for set and forget. Blue iris is for tinkerers. You'd need to apply windows updates etc on a blue iris rig, the NVR will be zero maintenance, but blue iris has more features.
It depends on your appetite
For you, blue iris (or Scrypted) will definitely be better thenI already use pfsense as a router, Truenas for my NAS... throwing something else on the barbie to tinker with is not a bad thing as long as the overall end result is better.
For example, the pfsense router is better than any off the shelf router for a reasonable price in my opinion.