The verdict

CPU
Beelink SER7 has 1.6x the CPU throughput (28,351 vs 17,853 PassMark).
Plex
Beelink SER7 transcodes more 4K HDR streams (~5 vs ~3).
Idle power
Beelink SER7 idles lower (14W vs 20W) - cheaper to run 24/7.
Networking
Aoostar WTR Pro 5825U has more NICs (2 vs 1) - better for a firewall or VLAN trunk.

Which wins for each job

Job Aoostar WTR Pro 5825U Beelink SER7
Plex / Jellyfin ~3 streams ~5 streams win
Frigate NVR add a detector add a detector
Proxmox / VMs 17,853 PassMark 28,351 PassMark win
Firewall / router 2 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 Aoostar WTR Pro 5825U Beelink SER7
Price (list) $389 $399
CPU AMD Ryzen 7 5825U AMD Ryzen 7 7840HS
Cores / threads 8 8
PassMark 17,853 28,351
iGPU AMD Radeon (Vega) Radeon 780M (RDNA3)
NICs 2 1
NIC model Realtek RTL8125 Realtek RTL8125
RAM max (GB) 64 64
M.2 free 1 1
PCIe slot none none
Idle (W) 20 14
TDP (W) 15 54