I use the built in system with a redundant back-up…my Wife often enters the destination on her iPhone then argues with the sat-nag, me, the iPhone and herself…not necessarily in that order.
I always use sat-nav with the voice/beeps off*, years of being on a motorcycle means I am not worried about hearing an instruction, seeing it is all I need.
* My first sat-nav was a German unit, it had very precise instructions “Turn Right NOW” & I liked that. I hate the “turnrightintobreadslicestreetin450yardsturnrightintobreadslicestreetin400yards” nonsense they all seem to do now, its just an avalanche of noise when all you need is a simple instruction.
In life, it's not who you know that's important, it's how your wife found out.