PD stands for power delivery, it's a charging standard:
GaN is a newer gallium nitrate based charger which is more efficient and smaller than traditional chargers.
If you want 65w pps get a multi port GAN so you can also charge your controller and/or something else at the same time:
https://www.amazon.com/Charger-Charging-Station-Pixelbook-ThinkPad/dp/B0BYHJ8FD6/
Or if you want really small...