The best controller for steam deck is one you already have. My PS One Analog is still working, tho through cable with more than a decade old PS2 to PS3 USB converter.
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/product/06/8193412/1.jpg?5327 "Generic Wireless Game Gamepads For PS3/PS2 Controller Joystick For Playstation2/3 Gamepad For Windows Android Smart TV/TV Box | Jumia Nigeria")