Would you prefer open or closed headphones?
Open headphones usually have a better soundstage but leak a bit of sound outside. So if you're blasting music, the person next to you and him will be able to hear the melody of it, while you can also hear the outside environment.
Closed headphones don't provide as great a soundstage, but they are better at isolating your music and you won't hear the crowds around you.
If you listen mostly at home or in isolated areas, I'd definitely get the open headphones, otherwise closed headphones is just as great in loud environments.