Why do you even care about breaking your oath? is it just for RP? I prefer oathbreaker in all version of D&D because it is not restricting, its paladin without any remorse or limits on morality. That makes it fun, your closer to a Heratic from Dragon's Nest and that is SICK. Base paladin is over rated
Yes, for roleplay. And for narrative cohesion. Even if I play an oathbreaker, I want the story of how they became one to make sense.
Oh, and to experience the variations on subclass abilities and progression.
I don’t see it as picking between a base paladin and an oathbreaker. Chances are, I’m going to try both (or rather all, given there are different oaths) in different playthroughs.