Defence Systems Daily: Germany's Leopard 2 remains the world's best tank
The Pentagon's gas turbine-powered M1 Abrams may be the first tank that comes to the minds of most Americans, but overall, Germany's Leopard 2 is the world's best. In a new analysis of the world tank market, Forecast International/ DMS finds that, based on an overall comparison in terms of lethality, fightability, mobility and survivability, the Leopard 2A6EX comes out on top. The annual tank analysis and ranking, the only one of its type available from open sources, is a product of Forecast International's Weapon Group.
taken from http://www.rheinmetall-detec.de/index.php?lang=3&fid=810
i hope that helps you lot.