IP-Country vs GeoIP vs IP-To-Country

So far, I have found 3 ways to check the country of the IP address

Using
IP-Country on
http://search.cpan.org/~nwetters/IP-Country-2.20/
This uses a flat file system, databased downloaded directly from 3 major IP assigners arin.net etc

GeoIP
http://www.maxmind.com/app/geoip_country
uses either cvs to sql or binary database

IP-To-Country
http://ip-to-country.webhosting.info/
CVS format, cvs to sql

I wonder if anyone knows

1 which database/system is the most accurate
2 which is the fast: 1 flatfile 2 binary data 3 sql

 

 

 

 

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