I bought a wheel, but I still use a controller. Yes, the controller has a disadvantage, but I look at it as an added challenge. The payoffs of buying a wheel are being able to drift with smooth countersteer and better control over long drifts. The drawbacks to a wheel are its bulkiness and adaption time. I use my controller because its smaller and i can use it for other things too. I found that in order to be able to compete with wheel users, I hafta use my controller as if it is a wheel. That means if I want to drift seriously, I can't tap the gas, brakes, or steering. I hafta learn how to depress the gas and brake buttons to a certain level and hold the analog stick in a certain position. This is the only way to have smooth long drifts on soft corners without jumpy countersteer and loss of control.
So if you want to just be able to drift, then get used to tapping the steering and buttons. If you want to drift with the best of them, then get used to moderating your use of the controller.