1
Help me choose my next lab PC (from rpi4)
(alien.top)
The most important part of a Frigate NVR is the Coral Edge TPU. As long as you can secure one, you'll be set. The USB version is easiest to use, since it doesn't require installing drivers and most PCs will have a USB 3 port.
All the processors are good enough for a small NAS and NVR.
I wouldn't buy a PC without SATA ports or an expansion slot. If you go the mini-pc route, where would your store your HDDs? An expansion slot would let you one day add an HBA card for more SATA connections. By default, it looks like all those motherboards have limited SATA connections. The 7080 Tower says it has 4 SATA connections, but only 1 of them looks like its the full speed SATA3.