Argon ONE M.2 SATA Expansion Board for Raspberry… vs 5V 4A USB-C Power Supply for Raspberry Pi 4 — Head-to-Head (2026)

Our verdict

Argon ONE M.2 SATA Expansion Board for Raspberry… is our pick.

For a Raspberry Pi 4 owner who already has the Argon ONE V2 case, the Argon ONE M.2 SATA board is the better buy — it swaps the microSD card for a USB 3.0 UASP SATA SSD and is the only one of these two parts that changes what the machine can do. The catch is absolute: it fits the ONE V2 case and B-key/B+M-key SATA drives only, while the inexpensive iUniker 20W supply works on any Pi 4 (1GB–8GB) or Orange Pi 5/5B out of the box.

Buy the Argon ONE M.2 SATA Expansion Board if you own an Argon ONE V2 case and a Pi 4 running a 24/7 workload — Pi-hole, Home Assistant, Docker, Frigate, RetroPie — where microSD write wear is the failure mode you keep hitting. Buy the iUniker 5V 4A USB-C Power Supply if you are seeing the undervoltage lightning bolt, are running a Pi 4 or Orange Pi 5/5B off a phone charger, or want a switched, UL-listed 20W brick with a 5 ft cable for a kiosk or classroom bench — and buy it first if you are adding any USB-powered storage.

SpecPicks editorial verdict, written June 9, 2026. Prices move, so check the current price on each listing before you buy.