The verdict

CPU
Trigkey Green G4 has 1.2x the CPU throughput (5,307 vs 4,300 PassMark).
Plex
Trigkey Green G4 transcodes more 4K HDR streams (~5 vs ~4).
Networking
Topton N5105 4-LAN has more NICs (4 vs 1) - better for a firewall or VLAN trunk.
RAM ceiling
Topton N5105 4-LAN takes more RAM (32GB vs 16GB).

Which wins for each job

Job Topton N5105 4-LAN Trigkey Green G4
Plex / Jellyfin ~4 streams ~5 streams win
Frigate NVR ~4 cameras ~4 cameras
Proxmox / VMs 4,300 PassMark 5,307 PassMark win
Firewall / router 4 NICs win 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 Topton N5105 4-LAN Trigkey Green G4
Price (list) $189 $189
CPU Intel Celeron N5105 Intel Processor N100
Cores / threads 4 4
PassMark 4,300 5,307
iGPU UHD Intel UHD (24 EU)
NICs 4 1
NIC model Intel I225-V 1GbE (chip unlisted)
RAM max (GB) 32 16
M.2 free 1 1
PCIe slot none none
Idle (W) 8 8
TDP (W) 10 6