My present Xtrail Nissan factory satnav is good enough for me, but its mapping must be from something like 2007, I could buy a DVD update for around 40, but bought the Garmin instead primarily for walking, rather than spend 3 times more for a dedicated walking satnav. But to show any new roads.
The Nissan comes with a 7" screen on my model year, on the 2013 model that has shrunk, and now become a hard drive unit, but does do post codes which my 2009 model doesn't, so I can't comment on the latest Nissan satnav.
If someone was to ask me what I wanted it would be what I have already, but the ability to take post codes and show speed cameras, and more importantly calculate routes suitable for caravans.
ironically TT do a 5" caravan and lorry satnav at around300, not built in though.
The garmin maps are also like the CX5, poor resolution. And its most irritating in that it gives direction with street names, while I prefer road numbers as shown on a road map.
Its guidance also leaves a lot to be desired, while the Nissan gives more precise directions.
The Nissan also has push buttons, NO on screen touch controls, which I prefer to the TT.
My daughter has a Merc E class were again the screen resolution is even better.
I've only used the TT satnav on one trip a 30 mile route from the dealer to my home and back.
In that time the signal was slow, showing the car position in incorrect positions, missing turn off instructions, showing positions off the road, poor for a 2013 car, along with the low resolution screen, all fitted into a tiny screen, isn't what you expect on a new car, I'll be really pissed if this unit is replaced next year for a proper satnav.
I also have trouble seeing the screen detail, so I'll have to start driving with my reading glasses, something I don't have to do with the Nissans 7" screen.