We have old Garmin and TomTom boxes which we hardly ever use now, kept in the car as a backup. They both worked well at a push I’d say TomTom was better. We had all europe road maps but tomtom needs a subscription for decent traffic info.
We are all phone app now and use a cable in the car for power and/or sleep the screen esp on motorway. App works in the background and speaks when its time to give directions
We also use Waze (very good in France, @orange is based there too) which operates like a social network so things like accidents and police speed traps update much faster than TomTom / Garmin. It works well in UK but not as many active users so traffic updates aren’t quite as good.