The one thing I see standing out the most in this thread is the majority of people talking about speed...Speed is not everything when it comes to drifting. It seems as though everyone has forgot about angle and line, not to mention simply linking all of the corners. I use Comfort Hards all day everyday on every one of my cars I use for drifting. I can keep up with those who use Sport Tires and continuously drift an entire track. Skill plays a lot into deciding which tires to use for drifting. I've been drifting since FM2. GT is more realistic as far as drifting is concerned, and Comfort Hards are more realistic then Sports IMO. Yes you may be able to kick the back end out and hold it through a corner, but what happens when the corner is over and chicanes come out, or you have to swing into another hairpin or a sweeper for that matter. With Comforts I can swing into a corner and have more angle, consistent speed, and link every corner after that unlike Sports.
Speed is not everything, you may be able to leave someone in the dust. But in a competition leaving someone in the dust and someone else linking all the corners with a better line and angle is what the judges are looking for.