I voted for Prince Hashem, he is the cutest but the most handsome one is Ali.(In my opinion)
If you have asked the most handsome I could vote for Prince Ali.
Between ,I have to agree with Humera, personality is important,too.
My comments for the others:
King Abdullah has a cute face but I think Prince Hashem is cutier.
Prince Hamzah is handsome but he is really short!
Prince Feisal is normal.