I am a fan of tang, not a fan of zing, when it comes to coleslaw. I feel green cabbage has a natural Zing (aka spicy bite) to it when its in its raw state. Similar to eating a raw onion.
That said, i do love horseradish. When i make cocktail sauce i add 75/25 horseradish,ketchup. Not sure why raw green cabbage bothers my throat more then actual spicy vegetables.