Best Way to Build a Sequence of Branching Timelines

I apologize if this is a stupid question as I am new to Unity and game dev in general.

Which would be the best method for creating a series of branching cutscenes?

For example,
Timeline 1 plays, then the player is met with branching options, then either Timeline 2 ,Timeline 3 , or Timeline 4 plays based on player’s chosen option.

Would the best method be
Timeline1-> GameObject hits Triggerbox containing UI of choices-> specific timeline

or

just adding an activation track for the UI Choice script in a timeline?

Also would these methods be scalable?

thanks