What is the best GPS to buy in Canada - for use in the local city, and for use travelling within Canada, or Canada to USA, or within USA.

I have used a Tom Tom model in previous years - I was quite satisfied.

The question is whether to buy some Tom Tom model, or some Garmen model.

I also wonder about 3 features:

i) text to speech
ii) uploading/upgrading/updating maps for minimal cost or for free
iii) a GPS with a traffic feature - where the traffic information can be used without extra cost, or with minimal added cost. Which cities in Canada can the GPS provide this information. In particular I am wondering about Ottawa. I suspect such a feature is possible in Toronto, Vancouver, Montreal, and perhaps ? Calgary.