The Flash VM performs really well on mobile chipsets and I don’t see any evidence here to support the idea that Flash is slow on smartphones and tablets. High end videos are below par at the moment, but the 3.1 release of Honeycomb illustrates that firmware updates are the key to solving this issue.
His testing is quite thorough. Adobe paid for his time through his employer, EffectiveUI, having noticed his earlier benchmarking work. I feel confident that you will find his testing thorough and unbiased. Check it out at the link above.