The verdict

CPU
Aoostar GEM12 has 1x the CPU throughput (28,362 vs 28,292 PassMark).
Plex
Aoostar GEM12 transcodes more 4K HDR streams (~5 vs ~3).
Idle power
Acemagic AM08 Pro idles lower (12W vs 13W) - cheaper to run 24/7.
Networking
Aoostar GEM12 has more NICs (2 vs 1) - better for a firewall or VLAN trunk.

Which wins for each job

Job Acemagic AM08 Pro Aoostar GEM12
Plex / Jellyfin ~3 streams ~5 streams win
Frigate NVR ~4 cameras win add a detector
Proxmox / VMs 28,292 PassMark 28,362 PassMark win
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 Acemagic AM08 Pro Aoostar GEM12
Price (list) $499 $479
CPU AMD Ryzen 7 8845HS AMD Ryzen 7 8845HS
Cores / threads 8 8
PassMark 28,292 28,362
iGPU Radeon 780M Radeon 780M (RDNA3)
NICs 1 2
NIC model Realtek 2.5GbE Realtek RTL8125
RAM max (GB) 64 64
M.2 free 1 1
PCIe slot none none
Idle (W) 12 13
TDP (W) 54 54