I went from GT to 159 just over a week ago, works well with the kids which was our reason for changing, more practical etc. The 159 is a better car in just about every way, much better chassis and ride quality, significantly better build quality (although my dash creaks occasionally) From a pure driving perspective I think the GT was more fun, I don't get the same urge to chuck the 159 about, it's still a great handling car but obviously heavier than the GT, that said I wouldn't say the GT would be any quicker across country.
I've got no regrets about the change, I'm really enjoying it and when it comes to the business of transporting the family in comfort the 159 is the better car.
159 1.9 Lusso
1.9 GT . Koni FSD . Eibach Pro . Sold .