Sure GDi has better tanks but from personal experiance Infantry own the battle field (in Under anyway). If GDI are attempting a tank rush use Ravenshaw to support the Nod vehicles. Stand back behind the Nod vehicles and shoot at the enemy vehicles. I personally think the mammoth is way over rated. Its to big and slow for a map like under. Mammoths just get in the way of each other. This makes them easy targets for characters such as Ravenshaw. Medium tanks, APC and Humves scare me. There small faster and more manuverable making them harder to hit.

Dontshoot