The verdict

Frigate
Hailo Hailo-8L (M.2) handles more cameras (~16 vs ~5).
Fit
Google Coral USB Accelerator is easier to add to a mini-PC (USB, fits any box).

Which wins for each job

Job Google Coral USB Accelerator Hailo Hailo-8L (M.2)
Plex transcode none none
Frigate NVR ~5 cameras ~16 cameras win
Local LLM none none
Fits a mini-PC USB, fits any box win M.2, needs a spare slot

Approximate - capacity estimates from curated specs, the same logic as the recommender. Verify against your exact setup. Prices move; check the retailer.

Full specs

Spec Google Coral USB Accelerator Hailo Hailo-8L (M.2)
Price (list) $60 $70
Type tpu npu
Interface usb m2-ae
Transcode - -
Frigate detector EdgeTPU (native) Hailo
TOPS 4 13
VRAM (GB) - -
Low profile no no
GPU sharing - -
Power (W) 2 2