Cant say as it depends on what I driving and I am in the middle of trying various ones out just now. Spent the past two years with igo8 in my Binatone for the car but that could be difficult to see the arrow pointing at exits from the motorway and a few times I was at the junction before the sat nav. Got Igo Primo in just mow and going to try it tomorrow.
When on the bike I will be wanting voice more than vision so thinking Bluetooth so my sat nav is out. I am trying a few also on the Android. Got sygic, route66, Navion and Navfree in the phone just now to try. Binned tomtom due to it having issues turning on the GPS. I think more a Kitkat problem rather than TT though. Binned CoPilot live what was a shame as that looked nice. It would not save to my SD card. Not enough storage in the phone. I do like the look of navfree best but I don't think that has lane assist like the tomtom and primo. So far Route66 is working my GPS best and I kind of like the simplicity of it. Shame is has no real lane assist unless it has in a later version.