Nexus and iPad user here. Google Now (predecessor of Assistant) is light years, dozens of light years ahead of Siri. Not only about what it can do / answer, but also the speed and the accuracy. There's no debate here.
[doublepost=1475615673][/doublepost]
Well, I would like to debate your claim:
I find that Google Now hears more accurately sometimes, (with the exception of with Apple tvOS , where Siri has the highest accuracy, though they've limited her reach with the TV.)
On the other hand, I am going to assume you haven't used Siri much. Because I use both and no offense intended, but to say Siri is light years behind Google Now is almost laughable. I can't think of any thing that Google Now can do that Siri can't. I use Siri throughout the day to set alarms/timers, reminders (location based and time based), send texts, read me emails, answer basic questions about sport scores, weather, etc.. What are those capabilities that would put Google "light years" ahead????
Again, you might prefer one over the other, but Siri is very capable, and in some cases exceeds Google Now, e.g. sports. I'd encourage you to give Siri a try. It sounds like you might be surprised. . Here's a quick amateur video comparison from early this year, before Siri gained even more capability and Apple turned on natural learning, e.g., with mapping, such as telling you when to leave for appointments based on traffic, etc., and iOS 10.
I