RWD handles better because of oversteer. You apply throttle while steering and it steers more instead of less. That feels good and it's the reason sports cars are RWD. AWD doesn't handle and feel as good unless it's biased to the rear. Most AWD cars aren't even symmetrical, they're FWD until the front wheels slip, which meas you're already understeering.
Most all RWD cars with IRS with adjustable toe are bump steered to push the rear toward the inside of a turn as the car leans into the outside of a corner. eg understeer.
This is to keep the avg idiot from wrapping the car around a tree driving to work. When you have alot of power it becomes outright dangerous. The handling becomes unpredictable as the car leans into the turn and the toe changes under suspension lean cause the rear to understeer making the rear feel planted, then application of throttle breaks traction and inertia causes a sudden reversal to oversteer. This confidence inspiring understeer followed by throttle induced snap over steer is responsible for nearly all those youtube videos of people going off road.
Zeroing out the factory bump steer in the IRS Cobras makes it 100 times more predictable and linear. Managing a "accidental" power slide is much easier when your ass end feels weighed to the outside from the start and you know where your break point is.
Also effortless to recover from when there is no sudden unpredictable change in inertia; simply lighten up on the throttle to reel in your sliding without any shift in the suspension loading.
If you do that in a RWD car designed to understeer as they are from the factory, that's when you get the lift off oversteer and fishtailing as the grip reconnects and violently reloads the suspension back into bump steer induced understeer while you are in the middle of counter steering. Bad.
You can also cause a RWD car to understeer by engineering for specific front to rear staggered tire sizes with diff tread and compound. If you have unlimited grip in the rear and none in the front, it won't matter if you are in the throttle, you will plow front first into the curb.
Bottom line, it doesn't make a diff to avg Joe in a stock car. Unless you tuned the suspension yourself, you can't make general assumptions about whether a car will understeer or oversteer based solely on its drive train layout.
