I want to buy a game controller that will work with Android, iOS, Mac, and Windows. (Big bonus points if it will work with old OS versions.) I want it to be able to physically clip on with my phones.

(EDIT: If it's a common enough controller then it doesn't need to have a clip for phones because there are probably separate clips i can buy and add on myself.)

There are so many controllers out there that I'm overwhelmed! What's a great works-with-everything controller?