I think Flash better than HTML5, flash is faster, more powerful, more common, and supports 3D. But HTML are very slow and not powerful. And I think that the idea of ??HTML5 was a failure, flash is much better! And so we should not forget about Ekse, because it is the fastest exporter at the moment.
Comparing HTML5 to Flash seems a bit unfair to me. Flash has had time to evolve and reinvent itself many times over, whereas HTML5 is a new medium who has only just begun.
I've had the opportunity to work with Flash over the years in web development, and as much as I might love it, web design changes very quickly over time, and Adobe sure doesn't make Flash cheap, so I can't always stick to the same tools over time. (Unless I wanted to keep making websites with animated gifs a la 1996)
Tools are just that, tools, and the idea of a tool that lets me make something viewable on my desktop, netbook and cellphone, out of the box, is a pretty big one.
On topic with BoyHK, I think a few more exporters would definitely be awesome in the near future. Perhaps Android and IOS, since the mobile market is freaking expanding at a ridiculous rate.