I’ve flip-flopped between both over the last 10 years or so. I would agree that the GS is much better for a spirited drive on country roads because of its size, but also it is just that bit more precise and you get a bit more communication from the chassis and tyres. But the GT is better for longer journeys on wider roads - albeit I did Monaco and back in my GS Spyder and it was excellent. I also find the GS seats a lot more comfortable than the seats in the GT, even the facelifts seats. Truth is they are very different cars in looks, size and feel, the GS being curvy and more modern classic feeling with a lovely very hand built feel to the interior, whereas the GT has more edges, looks more modern, and the interior feels a little more generic. And if you speak to the specialists they will generally tell you that the GS will be the cheaper car to run longer term, eg the price of parts for the GT is higher, and they are more complicated electronically so more to go wrong potentially.