Welcome to the forum.
Smart move reading the
cliff notes and other items in the
wiki.
Read How to Secure Your Network (Don't Get Hacked!) in the wiki also.
Quick start
1) Use Dahua starlight cameras or Hikvision darkfighter cameras or ICPT Night eye cameras (
https://store.ipcamtalk.com/) if you need good low light cameras.
2) use a VPN to access home network (openVPN)
3) Do not use wifi cameras.
4) Do not use cloud storage
5) Do Not use uPNP, P2P, QR, do not open ports,
6) More megapixel is not necessarily better.
7) Avoid chinese hacked cameras (most ebay, amazon, aliexpress cameras(not all, but most))
8) Do not use reolink or nest cameras (they are junk)
9) If possible use a turret camera , bullet collect spiders, dome collect dirt and reflect light (IR)
Read,study,plan before spending money ..... plan plan plan
The select between an NVR and BI is a personal decision.
If you want all the equipment for a single manufacture, then go with an NVR.
If you want to support different manufactures of cameras then BI is the way to go.
If you like playing around and improving things then go with BI, bi has growth potential.