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I have 5.0V 3A and 5.2V 3A regulated supplies that I can repurpose for my Raspberry Pi 3B project. Am thinking of using the USB power jack. Which should I go with?

5.2V would seem to be within the specs but is there any benefit over 5.0V?

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5.1 V is preferable if you are using a normal short cable. 5 Volt is good for a fast-charging cable. 5.2 V is good when you are using a poor quality of USB charger cable or a longer cable. The voltage is sometimes increased because there might be some losses through the cable. I gave you all the necessary information so far. You can now choose one easily.

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Both should be fine.

The 5.2V one may be better if you have a poor quality USB cable between the PSU and the Pi. Some USB cables have flimsy wires and drop significant voltage.

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Both voltages are tolerated by the Raspberry Pi 3B, but official documentation actually suggests 5.1V.

Higher voltages usually mean more power if the amperage is the same. Also a higher voltage might give a little more heat output, but 0.1V is very negligible.

I suggest using the 5.2V as some of it will be lost to the inefficiencies of cabling.

Source: Power Supply - Raspberry Pi Documentation

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