iOS now has the same functionality--I'm not aware if it's from Siri or iOS itself but if I have a location address in my appointment, I will receive a notification beforehand advising of current travel time and when I should leave. Sorry, can't post an example as I don't have an appointment on my calendar soon.
Yes, Google Now offers additional functionality not provided by Siri but I don't see them as identical services either. Google Now is polling your Gmail account to provide much of the information while the rest is provided based on dedicated parameters you have to manually set within Google Now (sports teams, weather locations, stocks), primarily determined by location services. I'm not criticizing it, quite the opposite--I really like using Google Now for this instant digital content, recommendations.
I admittedly haven't used Google Now recently on an Android phone so I'm not certain if the personal digital assistance functionality has improved but I found it lacking for functions like voice commands to complete a task (text messaging, creating appointments, getting directions from my contacts as previously described in other posts here). I more often than not would be provided with a Google search for somebody's name or location and often, completing functions still required screen touches (I believe this has improved IIRC). I use Siri probably a couple dozen times a day, mostly for voice command functions (messaging, making calls, creating reminders, making appointments) but also to opens apps, play specific music/podcasts and very occasionally, to look up information. No, she's not perfect but she's improved dramatically over the years and I find her voice recognition to be really good (hey, if she can recognize the name 'Gryglewicz' when spoken, she's doing quite well
).
Not sure how long it's been since you've used Siri by those searches are very quick now and straight into Apple Maps. I find navigation through Apple Maps to be better
on the iPhone than Google Maps (though I personally find Waze to be the best when taking into account traffic delays, accidents, etc and is my navigation app of choice) but if I need to location up an POI, Google Maps is generally far superior.