Which one is better for defence&attacking?Kickboxing or Taekwon-Do?

If I had to pick one or the other based on averages and the little experience of either art I have I would say go with kick boxing. In reality why not just look around at what schools are in the area you are willing/able to travel to and try a few sessions - you may find the style for you isnt just one or the other of these but something unexpected.