Well, I own:
Zenec 3711D with Igo (8 and primo - I can Change)
TomTom 720
Garmin on a Windows Mobile 6 Handy
Garmin Street Pilot Android-Handy
Igo Android-Handy
Navigon Android-Handy
RunGPS Android-Handy

But my best navigation System is all the years long my wife
She always know better the way than any gadget!!!