The verdict

CPU
Dell OptiPlex 7070 Micro has 1.5x the CPU throughput (8,038 vs 5,307 PassMark).
Plex
Morefine M9 transcodes more 4K HDR streams (~5 vs ~3).
Idle power
Morefine M9 idles lower (8W vs 12W) - cheaper to run 24/7.
RAM ceiling
Dell OptiPlex 7070 Micro takes more RAM (64GB vs 32GB).

Which wins for each job

Job Dell OptiPlex 7070 Micro Morefine M9
Plex / Jellyfin ~3 streams ~5 streams win
Frigate NVR ~4 cameras ~4 cameras
Proxmox / VMs 8,038 PassMark win 5,307 PassMark
Firewall / router 1 NICs 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 Dell OptiPlex 7070 Micro Morefine M9
Price (list) $160 $169
CPU Intel Core i5-9500T Intel Processor N100
Cores / threads 6 4
PassMark 8,038 5,307
iGPU UHD 630 Intel UHD (24 EU)
NICs 1 1
NIC model Intel I219-V 2.5GbE (chip unlisted)
RAM max (GB) 64 32
M.2 free 1 2
PCIe slot none none
Idle (W) 12 8
TDP (W) 35 6