I'm torn for my Marines Errant. None of them really jump out for a Chapter that specializes in drop pod and boarding assaults. I might just stick with Inheritors, as boring as that is.
+1 to charge definitely stands out for a drop pod focussed playstyle. It increases the chance for a successfull charge from 52% to 68% when re-rolling the lowest dice. The second part though ... no idea. ^^