Mine was always the old black Atari joystick with the square plastic base, fire button on the top left corner, and the rubber short stick :-D
You could hold that thing in both hands, and have a good solid grip while still being able to move the stick -- I could never get used to the bigger ones like the TAC or just about every other joystick.
Probably doesn't hurt that before my A500 I had an Atari 600, so we had lots of those sticks around
