You can use an external controller with the Steam Deck if you prefer it docked rather than in handheld mode. These third‑party controllers are great options.
The best controllers for Steam Deck are comfortable to hold, offer reliable inputs, and deliver simple connectivity to the handheld via a wireless Bluetooth connection or wired USB-C. Some gamepads ...
The Steam Deck is renowned for its customization possibilities, but this reasonably priced and easy DIY upgrade can completely change the gameplay.