In other words Supercruise, by having greatly limited funtionality, i.e. only being usable on limited access divided highways, is more predictable. Namely, I predict it won't work on any of the other roads where Tesla AP will work.
On the cases where Tesla AP may still struggle, e.g., cresting a hill on a two lane road, Supercruise is more predictable by simply not working at all on any two lane road.
That argument is not persuasive.
On divided limited access roads like I-95 I don't see how Supercruise cld be any better because AP is near perfect.
Can supercruise also change lanes? No.
Can supercruise do anything on the other 95% percent of roads that are not limited access? No.
The author of this article understands the issues better and explains how Tesla AP is better than Supercruise.
Tesla, Volvo, Cadillac: Which semi-automated driving system is best?