The verdict

CPU
Beelink EQR6 has 1.2x the CPU throughput (18,159 vs 15,230 PassMark).
Plex
Beelink EQR6 transcodes more 4K HDR streams (~5 vs ~4).
Idle power
Beelink EQR6 idles lower (10W vs 12W) - cheaper to run 24/7.
Networking
Beelink EQR6 has more NICs (2 vs 1) - better for a firewall or VLAN trunk.
Local AI
Lenovo ThinkCentre M90q Gen 2 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 EQR6 Lenovo ThinkCentre M90q Gen 2
Plex / Jellyfin ~5 streams win ~4 streams
Frigate NVR add a detector ~4 cameras win
Proxmox / VMs 18,159 PassMark win 15,230 PassMark
Firewall / router 2 NICs win 1 NICs
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 EQR6 Lenovo ThinkCentre M90q Gen 2
Price (list) $279 $260
CPU AMD Ryzen 5 6600H Intel Core i7-11700T
Cores / threads 6 8
PassMark 18,159 15,230
iGPU Radeon 660M (RDNA2) Intel UHD 750
NICs 2 1
NIC model Realtek RTL8111 Intel I219-LM
RAM max (GB) 64 64
M.2 free 1 1
PCIe slot none x8-lp
Idle (W) 10 12
TDP (W) 45 35