Is HTML5 geolocation more accurate than IP geolocation?

HTML5 geolocation draws data from the GPS of a device, while IP geolocation data comes from the ISP database, so there is a case to be made that HTML5 is more accurate. This is because the readings from HTML5 would be more precise and accurate when focusing on a particular device, whereas IP geolocation data only gives a fairly broad radius. However, there is a lot of value to be drawn from IP geolocation data.