Androxus loses because Zhin's kit is just slightly better. You can't miss a shot or you will die in most 1v1 situations. Even if Zhin loses the 1v1 somehow, he could just retreat to his team with Billow. Save your reversal as a last resort.
If playing against a Viktor, or any other hitscan champion, try flanking them, because they will have a longer time to react to the damage, and you can unload about two shots before they will detect you and start firing.