The verdict

CPU
GMKtec NucBox G9 has 1x the CPU throughput (5,385 vs 5,307 PassMark).
Idle power
Chuwi LarkBox X idles lower (8W vs 14W) - cheaper to run 24/7.
RAM ceiling
GMKtec NucBox G9 takes more RAM (16GB vs 12GB).

Which wins for each job

Job Chuwi LarkBox X GMKtec NucBox G9
Plex / Jellyfin ~5 streams ~5 streams
Frigate NVR ~4 cameras ~4 cameras
Proxmox / VMs 5,307 PassMark 5,385 PassMark win
Firewall / router 2 NICs 2 NICs
Local AI / LLM no slot no 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 Chuwi LarkBox X GMKtec NucBox G9
Price (list) $199 $199
CPU Intel Processor N100 Intel Processor N150
Cores / threads 4 4
PassMark 5,307 5,385
iGPU Intel UHD (24 EU) Intel UHD
NICs 2 2
NIC model 1GbE + 2.5GbE (chips unlisted) Intel I226-V
RAM max (GB) 12 16
M.2 free 1 3
PCIe slot none none
Idle (W) 8 14
TDP (W) 6 6