Which is better, first person or third? And which character should handle the narration?
Sometimes, it depends on how much of the plot the writer wishes to reveal at each point along the way. Other times, the writer chooses the POV character who has the most to lose, gain, or learn. Sometimes, the character with the best voice gets the viewpoint slot. First person is tight and allows the reader to know one character deeply. Multiple third is great for revealing lots of information—or competing lies.
Choosing the best possible POV takes full cooperation between You and Your Muse.