Simple, effective and appropriate
I never thought I would give an opinion on a product as banal as a power supply transformer.
But in the case of the Raspberry Pi and the use I make of it, it seems to me to be decisive.
This power transformer is suitable for the Raspberry Pi 3 Model B, especially if you are doing something quite complex and likely to require some power. The only drawback is that there is no switch, so we have to unplug the device.