Armor is the most important of mechanized ground units. The Conquerer is a well built, fast tank with a 120mm gun. Low slung, it is hard to hit, and even harder to destroy because of its armor.
The Type 20 Tank Destroyer has two jobs: one is to kill tanks. The other is to destroy things that the engineers can not destroy.
The Champion is another fast, well built tank with a 120mm gun. Built with its engine forward, it can absorb tremendous damage to its frontal areas.