The last three teams you unlock in Fusion (Tigron, Xios, and Piranha) all need different super weapons in my opinion.
Tigron should have the Penetrator because they have the heaviest ship and it even says in the game description 'good for ramming strategies.'
Piranha should have the shield drain because of it's low shield energy.
Xios should have the Nitro Rocket because it's a good all rounder and has good weapon tech to quickly eliminate people.