Looking for GPS and leaning towards Garmin?

We are soon embarking on a trip across Canada and the Northern U.S.A. We are in the market for a gps but after searching and searching I’m going a little cross eyed but I think I have narrowed it down to Garmin over TomTom or Magellan. The models I’m looking at are the Garmin Nuvi 1490T or the Nuvi 1390T. Does anyone have any experience with Garmin and these models? And if so, what are your experiences? And if anyone loves their TomTom or Magellan why?