1st world problem here, but I want to purchase a Shiro F3 online and in doing my research I came upon a F3R. The only differences I can see are the pocket clip and a couple screws, as well as the steel options. The F3 is available in CTS-40CP or Elmax, while the F3R is available in Vanax 37. Are there other differences I can't see, and what do you think about the steel options? Thanks in advance!