The verdict

CPU
GMKtec NucBox G5 has 1.1x the CPU throughput (5,820 vs 5,307 PassMark).
Idle power
GMKtec NucBox G5 idles lower (6W vs 8W) - cheaper to run 24/7.
RAM ceiling
Morefine M9 takes more RAM (32GB vs 12GB).

Which wins for each job

Job GMKtec NucBox G5 Morefine M9
Plex / Jellyfin ~5 streams ~5 streams
Frigate NVR ~4 cameras ~4 cameras
Proxmox / VMs 5,820 PassMark win 5,307 PassMark
Firewall / router 1 NICs 1 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 GMKtec NucBox G5 Morefine M9
Price (list) $180 $169
CPU Intel Processor N97 Intel Processor N100
Cores / threads 4 4
PassMark 5,820 5,307
iGPU Intel UHD Intel UHD (24 EU)
NICs 1 1
NIC model Realtek RTL8111 2.5GbE (chip unlisted)
RAM max (GB) 12 32
M.2 free 0 2
PCIe slot none none
Idle (W) 6 8
TDP (W) 12 6