I think people do change and that sometimes a "version" of them can seem sexier, cuter or more charismatic than other. That's one of the reasons people get divorced (why don't you buy me flowers anymore? why don't you keep your fitness anymore? etc). And sometimes a haircut can totally change...
The Behelit Apostle. He was the one with the better story.
And I don't know why but I liked the fact that he needed to tell his story to someone before the events that led to his merging (?) with that corrupted baby Caska had. And I liked even more the fact that he chose Luca.