ash wrote:It really is down to personnel preferenceRegards
I second that comment and it was the very thing told to me when I bought my first sat nav. Basically, I found that Garmin & TT had little between them. I decided on Garmin and have stuck with them ever since. In fact, the Garmin Nuvi 250 I take with me when travelling overseas is now 3 years old and I just update the UK and European maps each year.
Regarding the use time when run off the battery, never tried, but, on one journey, after an hour or more travelling, it was only then I realised that I had not plugged the lead into the socket, but the Nuvi was still running fine.
Having said that, it would not worry me if I needed to purchase urgently and it was only TT available. All better than being without.