Viper will always be better as long as her wall actually gives a combat advantage (the dealing instant damage as soon as you touch the smoke)

Harbors wall needs to slow somebody as if they just got shot 2-3 times in a row (you cant fucking move for shit when yo get shot) This will put it up there at the same level as viper wall. It should also last as long as a viper wall with the recharge taking the same time as going from 0 to 100 on viper util

The cascade wall should also do the same thing but it should be thicker and physically push enemies back a certain amount, lets say a lighter breach ult that doesnt stun you but just slows you down and pushed yo back.

The bulletproof orb is fine as it but it would be better if it turned into a normal smoke when destroyed.

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Harbor is currently infinitely inferior to viper and brimstone because he cant control space with molly or push people back with his ult, it just makes them move around.