RE: E rs4 for drifter
If they're both close in power characteristics, the choice is up to you. If they're not, choose the one that delivers smooth power output. That will be better for drift.
Brand types are not as important as power delivery. Also, excessiveamounts of powerare not necessary for drift, either.
Tire choice will be another. Bad tires will turn you off to drift, because if they don't work, you won't get good drifts. Good tires will help you learn, and make you a better drifter. Try these:
raikoudrifttires.com
I recommend the DXPE's. They are a good tire choice for smooth asphalt and concrete. And they last a loooooooooong time! You get three full sets for $18, so they are very affordable, too.