8bitdo SN30Pro Plus with the official phone mount. I love mine

It also works great as a Switch Pro controller, be it on Switch or PC (it has both xInput and Pro Controller modes built in)

https://www.amazon.com/8Bitdo-Sn30-Pro-Bluetooth-Gamepad-mac/dp/B07T8JKVNT/

https://www.amazon.com/8Bitdo-Smartphone-Bluetooth-Gamepad-Black-pc/dp/B07VGHS48G

You can also get the Pro 2 (it has physical mode switch instead of a key combo) but I can't find a phone clip for it on Amazon