The verdict

CPU
Minisforum N5 has 1x the CPU throughput (28,854 vs 28,621 PassMark).
Idle power
Beelink SER8 idles lower (10W vs 28W) - cheaper to run 24/7.
Networking
Minisforum N5 has more NICs (2 vs 1) - better for a firewall or VLAN trunk.
Local AI
Minisforum N5 has a PCIe slot for a low-profile GPU - the other needs a DIY build for local LLMs.

Which wins for each job

Job Beelink SER8 Minisforum N5
Plex / Jellyfin ~5 streams ~5 streams
Frigate NVR add a detector add a detector
Proxmox / VMs 28,621 PassMark 28,854 PassMark win
Firewall / router 1 NICs 2 NICs win
Local AI / LLM no slot PCIe GPU slot win

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 Beelink SER8 Minisforum N5
Price (list) $499 $510
CPU AMD Ryzen 7 8745HS AMD Ryzen 7 255
Cores / threads 8 8
PassMark 28,621 28,854
iGPU Radeon 780M (RDNA3) Radeon Graphics (RDNA2)
NICs 1 2
NIC model Realtek RTL8125 Marvell AQC113 10GbE plus Realtek 5GbE
RAM max (GB) 96 96
M.2 free 1 3
PCIe slot none x16
Idle (W) 10 28
TDP (W) 54 65