You forgot the SW which solves all of those issues whilst remaining the better handler and giving even more space. Even though I haven't got one I have to agree the SW is the better carCan of worms here lol.
My dad has a 156 GTA, I have a 147 GTA. I actually think the 147 is more comfortable in the back, my head rubs against the ceiling in the back of my dads 156, the 147 offers a bit more headroom in the back.
The 147 is more practical IMO too, as the rear seats fold down!