Having both a RWD and AWD in our garage, they are very different animals.
The RWD is light and sporty feeling in the steering. it takes the perfect amount of effort to move the wheel (normal setting). and the car feels light and playful and like a happy dog ready to bounce.
The AWD feels heavy in the wheel and more serious. It doesn't make jokes. if it does, it makes them in German, and they are very serious.
the AWD is WAY quicker in and out of the turns and whoa is it a fun ride in the twisties. But the RWD begs to be played with. the AWD takes away some of the fun, but adds the rip your face off feel.
Depending on my mood and the road, I'd be happy to drive either...
Also, the AWD doesn't send as much power to the back, so you don't feel like you need more grip from the OEM (18) tires. The RWD begs for more grip. the AWD uses available grip better, but again it's so serious about it!
Anything below 'the limit' of the tires/horse power... the cars are very similar. almost impossible to tell apart. Only when pushed do you notice the difference... and really... I still can't tell which I prefer.