This is an interesting article at GPS Review.net. Source: http://www.gpsreview.net/navteq-vs-tele-atlas/
Please be sure to also read his article (see link above) where both representative of NAVTEQ and TeleAtlas made their comments on this hot debate.
His Verdict:
His Verdict: The Verdict

As for the 250 business addresses, I was able to find 83% of them within the NAVTEQ maps. I found a few more, 89%, with the Tele Atlas maps. A difference between the two of only 6%.
The residential results surprised me. I expected to have overall lower matches since I would assume new housing developments (streets) pop-up more often than new business addresses. I was able to find 86% of the addresses from the NAVTEQ maps and 92% of addresses from the Tele Atlas based maps. The difference between map vendors here was again 6%.
His Conclusion:
TeleAtlas VS NAVTEQ
So would I now recommend Tele Atlas maps over NAVTEQ in the USA? Not necessarily. I’m keeping my prior position that the map vendor isn’t currently something that should be a big consideration when looking to purchase a GPS device in the USA. If these results are representative of the entire database the difference between them would only amount to finding less than a dozen more addresses in a year, navigating to a new address every day.