The only spec that decides a Plex box is its integrated GPU. Plex hands transcoding to Intel QuickSync or an Nvidia GPU and the CPU barely breaks a sweat, so "best mini-PC for Plex" really means "which iGPU, and how many streams before it chokes."

The list below is ranked on sustained 4K HDR transcodes - the heaviest common job. If your library mostly direct-plays to a smart TV, you need far fewer transcodes than you have viewers, and even an N100 has headroom to spare.

What to look for

Intel QuickSync
The reliable path. Iris Xe and 12th/13th-gen UHD lead; older UHD 630 still covers a couple of streams.
4K HDR tone-mapping
This is the killer load - it is what separates a 3-stream box from an 8-stream one. If you never tone-map, every box goes further.
Skip AMD here
Plex and Jellyfin support QuickSync far better than AMD's VCN. Pick Intel unless you have a specific reason not to.
Don't overpay on RAM/storage
Neither gates transcoding. Spend on the iGPU, not on specs Plex never touches.

The picks right now

# Pick Fit Price
1 ASUS NUC 13 Pro Top pick
Intel Iris Xe QuickSync - handles ~8 simultaneous 4K HDR transcodes.
8 4K transcodes
€405 Buy on Amazon
2 Minisforum UH125 Pro
Arc (Xe) Iris Xe class QuickSync - handles ~8 simultaneous 4K HDR transcodes.
8 4K transcodes
~$439 Check price on Amazon
3 Minisforum MS-01
Iris Xe QuickSync - handles ~8 simultaneous 4K HDR transcodes.
8 4K transcodes
~$599 Check price on Amazon

Ranked from curated specs, same logic as the interactive recommender and the calculator. Approximate - verify against your exact setup. Prices move; check the retailer.

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