Just by looking where Siri comes from it should be clear it's better. The biggest difference is that Siri doesn't have commands 'hard-coded', you can throw anything at her. Thus, the whole design of Siri is completely different than in voice control systems. Only thing that's comparable is the speech-to-text accuracy.
But I guess this just goes to show, once again, how easily anthropomorphisation comes to people; if the experience is good enough that customers start thinking about the software as 'her' rather than 'it', maybe Apple will have a hit on their hands.
I'm actually only concerned about the speech-to-text accuracy. It's the foundation on top of which all this AI stuff is built. If it's not better than Google's, the AI fancy pants stuff is just going to be another layer of complexity that will screw things up.
