The Cannon shoots slightly bigger bullets than the Basic Tank. With base stats, it has better bullet speed, damage, penetration, and reload. The Cannon has more recoil than the Basic Tank, although the recoil is not sufficient to use the Cannon as a ramming tank, like the Destroyer or Annihilator. The Cannon has a passive ability where the bullet will swerve at an angle 20% less than normal if the previous bullet hit an opposing tank.
The Cannon has a round body with one cannon. The Cannon appears similar to a Basic Tank, except the barrel is a bit larger. The bullets are larger as well. Seen below is a Cannon firing off some bullets.