interface vs type

// Using interface
interface Point {
    x: number;
    y: number;
}

// Using type alias
type Point = {
    x: number,
    y: number,
};

interface Point {
    x: number;
}

interface Point {
    y: number;
}

const p: Point = {
    x: 1,
    y: 2,
};

type Person = {
    firstName: string,
};
// Throw error: Duplicate identifier
type Person = {
    lastName: string,
};