Traction, traction and traction.
If you can keep a tight corner with minimal slide you'll take more speed with you through the corner and once you're through you have the traction to start accelerating.
If you slide you'll get the car to point in the right direction, but the car will not start moving in that direction until it stopped and the tires got enough traction to start pulling. Sliding may seem like the faster way of negotiating a corner, but really it's much slower. Sliding may be helpful in some tight corners where it's hard to get the car to turn around, but other than that it should be avoided.