It’s Blueprints obviously. That’s why Persona was made, to ease workflow, programming animation in native code would be pretty hard task.
Programming animation in C++ would not be simpler, since you’ll have to do most of the things by hand. I’m not sure about this one, but you probably would also implement state machines yourself, i don’t think the state machine used in Persona could be used in C++ side of things the same way as it is used in Persona.