I chose Sygic because it was the only gps mapping that offered offline nav when I bought it about three years ago. (My android pad is wifi only).
I really liked it, with a few niggles. In the early days an update occasionally meant a full re-install, and that always seemed to coincide with walking out to the car for a journey. A new interface was launched about six months ago, but I prefer the old one. (Where have I heard that before?).
The mapping accuracy and speed camera info has been faultless to the best of my knowledge. Traffic info also spot on when I've tethered it to a 'phone etc..
Several friends have it 'on my say so', and none have stopped talking to me.