The verdict

CPU
Beelink SER5 Pro has 1.7x the CPU throughput (17,851 vs 10,800 PassMark).
Plex
CWWK N305 6-bay board transcodes more 4K HDR streams (~5 vs ~3).
Idle power
Beelink SER5 Pro idles lower (7W vs 12W) - cheaper to run 24/7.
Networking
CWWK N305 6-bay board has more NICs (4 vs 1) - better for a firewall or VLAN trunk.
RAM ceiling
Beelink SER5 Pro takes more RAM (64GB vs 48GB).
Local AI
CWWK N305 6-bay board 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 SER5 Pro CWWK N305 6-bay board
Plex / Jellyfin ~3 streams ~5 streams win
Frigate NVR add a detector ~4 cameras win
Proxmox / VMs 17,851 PassMark win 10,800 PassMark
Firewall / router 1 NICs 4 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 SER5 Pro CWWK N305 6-bay board
Price (list) $239 $239
CPU AMD Ryzen 7 5825U Intel Core i3-N305
Cores / threads 8 8
PassMark 17,851 10,800
iGPU Radeon Vega 8 Intel UHD (32 EU)
NICs 1 4
NIC model Realtek 1GbE Intel I226-V
RAM max (GB) 64 48
M.2 free 0 2
PCIe slot none x1
Idle (W) 7 12
TDP (W) 28 15