Garmin StreetPilot vs TomTom USA for iPhone/iPod Touch is compared using two iPhone 4’s, one with the Magellan Premium Car Kit and the other with the TomTom Car Kit. We test both GPS apps on the road and look at things such as TTS voice guidance and traffic. Garmin StreetPilot (v6.5.3) TomTom USA (v1.6) Garmin StreetPilot is available in the App Store for $39.99 TomTom USA is available in the App Store for $49.99