Do you know the story of The Six Swans by An Tusheng? Your mother must tell you this story. In this story, a princess crosses the sea by swans, those six swans are her brothers. So I think the best way to cross the Atlantic is by swan.
First, if you cross the Atlantic by air or by sea. You must pay the ticket. It's very expensive.
Then, if you cross the Atlantic by yourself, you swim across the Atlantic, maybe the shark will eat you. It will be very dangerous.
In the end, I think cross the Atlantic by swan is the best way. And it's very safe and you can see many interesting things which you have never seen before on the way.