I had the DSG in the GTI, which I think was my first mistake. It was a great transmission, but I missed the hand/foot engagement of a full manual (although rev matched downshifting in corners while braking was pretty hot).
The Abarth has a busier ride... but I was accustomed to that from my Mini days. The Abarth is smoother than the Mini despite the semi-independent rear suspension. The Mini was at least as bad due to run-flat tires (these things are the devil, imho).
I don't miss the torque of the GTI. If it was faster, it was only marginally so... and it did it so smoothly that you couldn't tell you were going fast anyway. I turned 40 this year, so I'm not a kid, but the Abarth makes me feel like one. The GTI was pleasant... but it didn't make me excited like the Mini or Abarth. Apparently I like my cars to have personality (who knew?).
The Abarth is not perfect. I thought I might grow to hate the exhaust sound, but it's fairly quiet while cruising... we'll see if the cold winter weather makes it noisier. The back end twitches like mad under heavy breaking (threshold breaking). The suspension can get upset if you hit a bump mid corner. I wish we got the track day in Canada like in the US. I think I will try autocross for the first time next year... so that should be an interesting test of my abilities (and maybe the car's... heh).
The 2012s had no heated seats, which my butt might miss. But the Bose stereo is a billion times better than the Dynaudio in the GTI (biggest waste of money I ever put into a car option). I've been into home audio for 25 years and I'm pretty picky. Bose doesn't cut it in the home, but in the Abarth it's more than acceptable... at least it doesn't make my ears bleed like the Dynaudio. The GTI had a practical back seat (if that matters) and could hold 4 adults.
At 2200km, I'm still discovering the Abarth... but it continues to grow on me. And I literally giggle and smile every time I start the ignition. Something I can honestly say never happened in the GTI. Not once.