Should we cruise from Galveston or New Orleans?

My FI and I are taking a cruise in August 2011 with Carnival cruise lines. But my question is would it be better to cruise from the port of New Orleans or Galveston? The N.O. has better sail dates for us and the ship(Triumph) I hear is better, bigger and newer than the Ecstasy that sails from Galveston. Is the New Orleans port dangerous? What about leaving my car in the port, is the security there OK? I have family that lives in Louisiana should I just pay them to drop us off? I know Galveston is okay because I have sailed one time before but I am skeptical about New Orleans. Any suggestions or past experiences with sailing from New Orleans? Anything will help, thanks.