B4 counters heavy tanks ahahaha thanks for that laugh
The ML20 is not designed to counter heavy tanks, it exists to counter turtling, if your opponent doesn't turtle, then there's nothing to counter, hence it performs bad in this situations.
The B4 is designed to counter heavy tanks, as it has the DMG and the abilities to do so.
Again check the casts, it shows how to use it and in which situations.
![Honor icon](/images/replay/honor_icon.png)