Now that I own both a GT4 and 190, they are just two different cars to be compared directly, I loved driving the GT-Four, and as a drivers car, the GT-Four wins hands down, the combination of the power and the handling, however its not an easy car to drive every day, and espes on long journeys, where as the 190 has some power there when you want it, but can be driven on long journeys very comfortably.
Depending on what you want, if you want a car that is easy to live with everyday go for the 190, if you want a car that wont be doing many long journeys, go for the GT-Four