Owned both a gen 6 GT4 and currently have a gen 7 190 (as well as a gen 5 and 6)
The GT4 has to be 'driven' to get the best out of it and it will reward you for doing so, but I wouldn't say its a relaxing drive. Its fun, sounds great, looks great, but has a fuel thirst that isn't nice. Its built like a tank.
The gen 7 190 is much easier to drive, is nearly as quick once on the move, and drinks less fuel. But its very plasticky in comparison, doesn't handle as well, and doesn't look as good unless kitted up.
As an everyday car, the gen 7 is much easier to live with for a relaxing fast drive, but having said that the same could be said of a lot of other modern cars. Would I have a GT4 again? Yes, but probably only as a weekend car.