Q: I'm looking for the best joystick to wire/solder directly to a raspberry pi zero. Any suggestions on the most compatible?
A: It's all about the harness. Whichever stick you decide on you should have a harness that has all inputs sourced to one ground. For example, all sticks that connect to a PCB with switches attack will use this harness: https://www.focusattack.com/5-pin-wiring-harness/ Sticks that have their switches with .187 male connectors will utilize this harness: https://www.focusattack.com/187-to-5-pin-conversion-harness/ (this one you would just add the first connector linked to the end or cut the 5pin connector and mount directly.