The verdict

CPU
Minisforum MS-01 i9 has 1.2x the CPU throughput (26,658 vs 22,934 PassMark).
Plex
Minisforum MS-01 i9 transcodes more 4K HDR streams (~8 vs ~5).
Idle power
Dell OptiPlex 7020 Micro idles lower (9W vs 30W) - cheaper to run 24/7.
Networking
Minisforum MS-01 i9 has more NICs (4 vs 1) - better for a firewall or VLAN trunk.
RAM ceiling
Minisforum MS-01 i9 takes more RAM (96GB vs 64GB).
Local AI
Minisforum MS-01 i9 has a PCIe slot for a low-profile GPU - the other needs a DIY build for local LLMs.

Which wins for each job

Job Dell OptiPlex 7020 Micro Minisforum MS-01 i9
Plex / Jellyfin ~5 streams ~8 streams win
Frigate NVR ~4 cameras ~6 cameras win
Proxmox / VMs 22,934 PassMark 26,658 PassMark win
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 Dell OptiPlex 7020 Micro Minisforum MS-01 i9
Price (list) $750 $730
CPU Intel Core i5-14500T Intel Core i9-12900H
Cores / threads 14 14
PassMark 22,934 26,658
iGPU UHD 770 Intel Iris Xe
NICs 1 4
NIC model Intel 1GbE Intel X710 + I226-V
RAM max (GB) 64 96
M.2 free 0 2
PCIe slot none x8-lp
Idle (W) 9 30
TDP (W) 35 45