The joystick felt better as a controller IMHO to a degree - but the Itellvision disk was actually probably a bit easier to control with practice. Yes they had something you could slip on it for a joy stick.
The number pad was genius and allowed for directional fire in some games.
The side fire button were the worst ergonomics, especially compared to the orange buttoned Atari.
But looking back, the Atari games were all crap compared to the Intellivision. At least the 2600 games. A friend had an Atari Computer and had some cool stuff.
