There's been an extensive analysis of H2 over at Leeham News: see
here for the 34th wrap-up edition of said analysis.
Regarding killaroo's points, a difference between H2 and A1 is that you can more rapidly dump H2, partly because there's nowhere where doing so would cause environmental problems. Possibly one could aim to crash with as little H2 on board as possible.
The explosions at Fukushima were caused by the vented H2 spontaneously exploding as it vented (possibly aided by the O2 that one can surmise was also being vented). I've no idea what happens if you're venting a stream of H2 and some static discharge sets it off; possibly a very impressive "dump and burn" as used to be practised by the occassional SR71 or F111 pilot.