Hi
I have two sat nav's a Tom Tom Live for the car and a Snooper 6000 for the tow car.
IMHO, Tom Tom has better graphics and the lane guideance is fantastic,, as for the live bit and google search bit of a waste of time as on the few occassions i have allowed it to re-route me i have ended up in a bigger que, because everyone else as the same idea... my live subcription as just expired £47 to re-new for the year, i don't think so!!!!!
Regarding blue tooth, cannot comment as use car blue tooth
if i could only have the one sat nav i would opt for the snooper, Tom Tom has taken the caravan down to many narrow country lanes.