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How accurate are the geocoding APIs and what is the most accurate?

I am creating an application with Google Maps api with geocoding features. Obviously, I want to use the api, which is the most accurate. I pass the application the address, and I need to find it on the map, but I would be fine only by finding the latitude and longitude, and then I can use this to include it in any api map that I choose. From your experience, which api is the most accurate? Google, Yahoo, Bing, etc. And if you could give an approximate percentage, which would be great. I still use Google since it seems the most reliable, but I would think of a change for more accuracy.

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All free services will only be accurate for the road segment. For each road segment, the starting and ending street numbers are stored and then interpolated. This saves processing time and disk space, and also increases resistance to new buildings. However, this results in evenly distributed addresses or crashes depending on how street numbers are allocated in real life. In addition, street-side rules can be consistent. Consequently, free and low-cost services are not considered good enough for emergency services and even urban planning.

You mentioned robustness, this is good for using multiple APIs. use the most reliable first. if this fails, your program may try another one.

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USC , Texas A & M.
, http://geoservices.tamu.edu/Services/Geocode/", .

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