You could consider using a USB C extension cable. That way you can use the Deck’s built-in controls. I either do that or use my Steam Controller.

I don’t think most controllers are worth their price. I got a Bluetooth Xbox controller once and it was expensive, lacked features, and broke way sooner than it should have.

If you don’t need a wireless controller you can get a Logitech F310 for pretty cheap and I find those nice to use, but they don’t have trackpads.