I voted Flash because its layout is what I've been used to for the last 12-13 years. HTML5 has its querks and its downfalls – as all do during transitions – and I've been giving it a chance since Help chat officially transferred over to the new system. Up to now I've been impressed with it. As for my personal opinion, Flash will always be my go-to system and favourite of the two, but I suppose technology evolves and has to run with society, thus we have to expect changes (I'm not fond of change) to occur after a decade of Adobe.