The dangers of liquid hydrocarbons versus pressurized hydrogen is summarized here:
http://www.rmi.org/sitepages/pid536.php
I have some primary literature on this but I can't easily post it. I am also well aware of the dangers of pressurized gas vessels. I have seen the aftermath of several accidents but these are relatively rare and it is often quite difficult to cause one of these vessels to rupture. On average I still stand by liquid hydrocarbons being far more dangerous than hydrogen.