For me, the difference between chipping and pitching is more about loft you are delivering through impact and what part of the club hits the ground.

When you chip you are reducing the loft presented through impact and allowing the leading edge of the club to hit the ground after you hit the ball.  In the pitch shot, you are maintaining the loft on the club face and letting the bounce of the club hit the ground before you have hit the ball.

When you have a better understanding of the function of the club you are then able to make a more reliable shot choice on course.