DropMeNow

Hi everybody ...! I wanna buy a Speed helmet ... but at the moment I'm not sure which options are best ... 1) they offer soft and hard rachet straps. Which one do you think is better? And 2) Does a chin cup makes sense? Or is the chin strap better? And one more thing ... I prefer an internal audible. What are the pro's and contra's of an external port, beside the fact settings can be changed easier.