What grappling art would you choose to add to Shotokan Karate; Freestyle Wrestling or Judo?

Are you not being taught the grappling of your art? Shotokan contains MUCH grappling, and is very good if you have an instructor who was taught the grappling aspect. Judo is very good, but I don't see why you should need that if you are training in proper shotokan. Ask your teacher about this.