If comfort is what you are after I bet those do ride a little smoother. As for looks and performance, I am not a fan of your current set up.
There shouldn't be that big of a difference in ride quality between the 18 and 19 inch rims. What tires were you running and what was the air pressure. When I had my factory 19s I was running MPSS tires all the way around and the care rode very smooth.