I have ridden in the CT and
I have ridden in the CT and driven a prius (2016) since 2016. The CT certainly feels a bit comfier. I haven't ridden too far in one though.
What I know is that the newest gen prius is much faster accelerating than the CT... probably due to having no luxury items on board and a lower drag coefficient. The P is an aluminum can on wheels. I doubt there's any way to upgrade the handling (and safety) much on a prius besides larger rims. I wouldn't lower the suspension since it's already a bit low and scrapes on steep driveways, necessitating angled driving..