As far as I know, TeleAtlas, TT map supplier, has the better maps for Europe since it has had that market for a long time. For North America, NavTeq maps are generally better than TeleAtlas since TeleAtlas is a recent on this market. While some maps, such as the city of Boston, may be up to par if not better than NavTeq, the Canadian coverage is sensibly lower quality with blaring mistakes and omissions that make the maps of a doubtful quality. Eventually the quality will be overall comparable but it will take time...
People need to know that it takes time for TeleAtlas to make their corrections and, once made, are released to Tomtom who take three months to then release the maps to their consumers. This means a delay of around six months for our MapShare major corrections (those requiring design modifications) to be implemented. Since the maps are updated every three months, I think TT would get a major advantage on its competitors if they did offer a one year free update policy across its product line. If they can make their MapShare system work better, they would have a real advantage over its competition with the one year free map update. Also people would be more willing to pay for the new maps that way if the map upgrade policy was valid for a year. The idea of having up-to-date maps for a full year can be quite enticing for consumers when one gets to consider the maps get rather major updates four times yearly. I use major updates in opposition to MapShare updates.