When it comes to first-person vs. third-person, some writers choose their “person” based on the books they’ve read.
After all, if Harper Lee and J.D. Salinger can make first-person work to their main character’s advantage, why can’t they? Or, maybe, after reading the Harry Potter series, they think, “Third-person is definitely the way to go.”
But why not lay out all the advantages and disadvantages of both, so you can make an informed decision? Even then, you might try one and then switch to the other.
Knowing the differences, though, can give you a healthy headstart.