What is the difference between the two?
Try these articles:
http://www.suite101.com/content/traditional-and-simplified-chinese-characters-a111324
http://definingcharacters.com/blog/2006/02/22/traditional-simplified-chinese-characters/
So I guess it all boils down to which one is used more.
Unless you have some kind of Hong Kong or Taiwanese connection, you’re probably best to go with simplified.