> Personally, I preferred Cortana over Siri. And it basically comes down to speed and responsiveness. Cortana is much quicker to launch, and much quicker to find results.

I haven't used Cortana, and have only had disappointing experiences with Siri (after coming from Google Voice Search); how does the performance on Google Voice Search Compare? I wonder if the performance rankings are just a complete reversal of the quality rankings; If so, I wonder who's closest to the sweet spot?