I still can't choose between these two. Very different styles, but very, very similar results. Steyn gets a small advantage on the strike rate probably, but that depends on how much you value that. Ambrose probably didn't need to strike as quickly based on being on a somewhat better overall attack.
I'll look at the results of this poll, and it should determine which of the two nations of South Africa or West Indies, out of non Big 3 nations are more villianously underrated by the evil CW cabal. My guess would be the South African.
Edit: I was right, and have voted Dale Steyn accordingly. I think in the future he should be considered in the top, top tier with McGrath, Marshall, Ambrose, Hadlee if he isn't already.