Sean Christman of EffectiveUI has released the results for his latest test that measure HTML5 and Flash performance on mobile devices (smartphones and tablets). GUIMark 3 tests different tasks like bitmap drawing, vector drawing, compute tests, and video playback (all in all there are 200 tests).
The results might be a surprise for some but not for me. As Sean put it “Flash maintains a 2x performance lead over HTML5 on average”. I encourage you to read his post and let others know about this. I think this test confirms all the effort Adobe put in optimizing the Flash Platform for mobile. And it shows that it wasn’t just talk.
Disclosure: Adobe funded this effort, but anyone knowing Sean will know that he is more interested in finding the truth than favoring a particular side.