Weird. I was thinking with a wheel you could be more accurate and have better car control.
You do have better control. Its just harder to recover quickly when you mess up. You can change the direction if your wheels extremely fast with a controller, which is good for drifting and recovering from a mistake. With a wheel, you have to physically turn the wheel to turn the wheels. The wheel is better suited for precision turning. Id you don't screw up, the wheel is much better for racing. I use the wheel all the time but sometimes its easier to just use a controller. I prefer using a wheel and pedals for everything but drifting.