Where do I sit on the ferry to get the best view of the staute of liberty?

On the top tier and it will be open. But the top tier is the first one to get filled. If you are in the front line of queue, you get a better chance

Yes, @Vijay K is right. Best view is on the right side of the upper deck while you are passing the Statue Of Liberty

Yes, @VijayK is right.

If you listen or watch the Ships, you will know which side to sit on when you leave to go to Ellis Island or back to Battery Park