Answer and Explanation:
Writers may choose to use a first-person perspective in their narratives to be able to dive deeper into the narrator's feelings and thoughts. This perspective allows authors to develop the character of the narrator in a more complete manner, allowing readers to know more about him/her as they follow him/her around and "hear" everything he says or thinks. This makes for a more personal narrative.
On the other hand, writers may choose a third-person perspective to have more freedom to move around, so to speak. There are different types of third-person narration, but in general the narrator is able to accompany several characters, giving readers the opportunity to see events from different points of view. This makes for a less biased narrative, since readers are usually not limited to just one opinion or version of events.