Most Helpful Guy
Hot is always the most powerful as far as total package goes. Hot is someone you want to be with sexually. Sexy is also a powerful compliment, but it can be towards someone you find sexy, but not a strong desire to be with. Beautiful is also powerful and shows the guy is paying more attention to you, studying your specific features in more detail. Beautiful shows a bit more respect and a more "gentlemanly" way to express it.