Even though it was linked from an apple blog, this Siri v S Voice video is by no means a blowout. Both voice technologies have high and low points, and both falter (sometimes painfully) at points. Some of the issues may come from the accent of the tester of course.
The only real “edge” I’d give Siri in this example is having the voice feedback seems to make the technology more…. “friendly” compared to simply outputting the data to the screen, but I’m not sure if it’s just turned off on the Android phone (which does start speaking at 6:40 or so).