I finally got the Navteq 2011 maps installed. Comparison of Navteq VS TeleAtlas 2011 maps:
The TA maps have been nicely updated. The hwy signs now have route numbers on them as well. Also, there are many updated speed limit signs here now in Canada. New roads that have been constructed here are also now showing up in these new maps.
The Navteq maps do not really have any changes in them. Still no hwy signs are present that I can see. New roads have been updated, but that is it. Here in Canada, Navteq maps have always been more accurate, especially when on Rural roads, but that is now changing as TA is catching up in that dept, and the TA maps have more features (such as hwy signs and exits).
Using both, I would definately recommend the TA maps, however, it is definately wise to have both on the system, in case one is lacking the street in question (which has happened with older versions of the TA maps)