Having both a coupe and a GT until a few months ago, the GT is by far the easiest to live with. More comfortable seats, far more refined plus the benefits of having a hatchback. In my case the Fiat coupe is more reliable though.
I also have a GT in addition to the Coupe. I agree with Dan's comment above, but in my case, the GT has been spectacularly reliable - it turned 240,000 miles last week and hasn't needed anything that a car of that mileage wouldn't have had (I've replaced the turbo, clutch, suspension and brakes, so nothing out of the ordinary). Mines the rattly old 1.9 diesel though, not the glorious Busso