Motion at Sea
There really is not enough to tell from your description except that 18,000 lbs is pretty heavy for a 28 footer so you would expect both to be a little rolly because they would have comparatively deep canoe bodies.
There are a lot of factors that control the motion comfort of a boat. The main factors controling motion comfort would include weight distribution, buoyancy distribution, and dampening. Your description touches on buoyancy distribution, but does not address the other factors at all.
There is also a difference in how people perceive motion comfort. Individuals have different thresholds for discomfort and the triggers of discomfort are purely individual as well. In other words, some people are bothered by the speed of the motion more than amount of the motion and other people are affected more by the amount of motion than speed of motion. And still others are equally affected by both. On that basis a boat that rolls through wide angles slowly is no more universally comfortable than a boat that snap rolls through small angles.
You have really asked a short question that would have a very long answer to fully address.