[yamtaddle]

I've never managed to find a Wii-connector-to-USB adapter that wouldn't inexplicably die within six months, but the 1st-party SNES Classic controllers are basically perfect clones of the original. Ditto the NES versions they have. Wii Pro Controllers are also great and have a similar feel & quality, but with modern ergonomics (no rumble, though, so not great for e.g. Playstation games, and IIRC the triggers aren't analog, which is limiting)

You can connect Wiimotes to PCs over Bluetooth and use any of those Wii-connector controllers through them, which would make them wireless and solve the finding-a-reliable-adapter problem, but I've never managed to make that kind of set-up sufficiently stable. Always having to screw with re-pairing and such.

In the end, my go-to for BT emulation controllers is usually a PS3/4/5 controller. I haven't tried the XBone but I found the d-pad on the XB and XB360 controllers unusably inaccurate, and the face buttons weirdly slow when trying to play old-school Nintendo-hard games. Playstation controller d-pads are much better, and the face buttons feel quicker to switch between, for whatever reason.

[roflchoppa]

For d-pads on Xbox controllers, you can cut a cross out of an old plastic folder and wedge it between the plastic and the membrane for better feel. It makes the pad crispy. 10/10 all my old controllers have it, too bad no one to play halo3 with. :(