From a motorsport point of view there is NO comparison between the two.

AVO are fit for competition, GAZ are fine for road in my eyes.

Other than thicker plating its hard to stop rust on any coilover. They can't be treated as a fit and forget item like a normal powder coated shocker.

They are derived from motorsport use and as such need to be looked after. If yours have rusted so bad then thats your fault for not looking after them correctly