The verdict

CPU
Beelink SER8 has 5.4x the CPU throughput (28,621 vs 5,307 PassMark).
Idle power
Beelink SER8 idles lower (10W vs 14W) - cheaper to run 24/7.
Networking
Ugreen NASync DXP4800 has more NICs (2 vs 1) - better for a firewall or VLAN trunk.
RAM ceiling
Beelink SER8 takes more RAM (96GB vs 16GB).

Which wins for each job

Job Beelink SER8 Ugreen NASync DXP4800
Plex / Jellyfin ~5 streams ~5 streams
Frigate NVR add a detector ~4 cameras win
Proxmox / VMs 28,621 PassMark win 5,307 PassMark
Firewall / router 1 NICs 2 NICs win
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 Beelink SER8 Ugreen NASync DXP4800
Price (list) $499 $499
CPU AMD Ryzen 7 8745HS Intel Processor N100
Cores / threads 8 4
PassMark 28,621 5,307
iGPU Radeon 780M (RDNA3) Intel UHD (24 EU)
NICs 1 2
NIC model Realtek RTL8125 Intel I226-V
RAM max (GB) 96 16
M.2 free 1 2
PCIe slot none none
Idle (W) 10 14
TDP (W) 54 6