The verdict

Plex
Intel Arc iGPU (Core Ultra) transcodes video; AMD Ryzen AI (XDNA2) is detection-only (no transcode).
Frigate
AMD Ryzen AI (XDNA2) handles more cameras (~60 vs ~25).

Which wins for each job

Job AMD Ryzen AI (XDNA2) Intel Arc iGPU (Core Ultra)
Plex transcode none ~8 streams win
Frigate NVR ~60 cameras win ~25 cameras
Local LLM none none
Fits a mini-PC built into a CPU built into a CPU

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 AMD Ryzen AI (XDNA2) Intel Arc iGPU (Core Ultra)
Price (list) - -
Type npu igpu
Interface built-in built-in
Transcode - H.264/HEVC/AV1 encode
Frigate detector maturing OpenVINO
TOPS 50 -
VRAM (GB) - -
Low profile no no
GPU sharing - sr-iov
Power (W) 0 0