Redline empowered 3>hold 3.
The ability tip section says this shreds armor. It shreds such an insignificant amount that it may as well not. If I'm going to rush into range of heavy gunners, napalm, etc, stop moving to double cast my 3, it needs to remove ALL of their armor. Saryn can remove entire maps ENTIRE armor in seconds with her spore ticks, giving this to gauss isnt going to break anything.
Gauss' ability damage is 100% useless at high levels, even the slamming from his 1 while kinetic plating active making them deal slash and slash procs dont matter when the ability has 800 base damage and you're fighting enemies with tens to hundreds of thousands of hp.
Please consider giving gauss a real way to do damage with his kit, hes a selfish frame in that he doesn't bring anything to the team outside of small aoe CC at best, and his own damage.
Maybe massively increase the damage his 1 with kinetic plating does, and also make it so you can apply that damage just by bowling over the enemies. Even better, allow his 1 to stack with melee mods, ala landslide.
Bottom line is right now gauss feels badass to play but he hits for pillow fight damage.