The measure is the word variation from the Original Text in the Hebrew and Greek. The American Standard and the KJV . Have the shortest bars on that graph. The text of American Standard is based on a newer group of manuscripts from known as the Codex Alexandrinus however the KJV is based on the older text from the majority of texts Textus Receptus. These two versions are the closet to the original writings ( autographs) with the least word variation, with a nod to the KJV for the majority of manuscripts. Also there is no equal to the KJV for cohesiveness and cadence and flow in reading. I recommend using one version and it is the closet . Use one version for your relationship with the Lord. Stuff yourself with the Word of God keep it in close contact with your soul that you might me washed by the renewing regeneration of the Bible . Be transformed by the renewing of your mind , I may be preaching to the choir but give the Holy Spirit something to bring to your remembrance and stick with one version . Using the others for comparison is appropriate . I love my KJV after all it is the one that Paul used. ( just kidding)