Which is better, Shrink or Coolsonic?

Since Shurink is the most recommended entry-level lifting treatment, I have been looking up information on various clinics lately. In the meantime, I've noticed that pain levels vary greatly from person to person, with many people saying it is painful. As I am sensitive to pain, I am looking into alternative lifting options and am curious about Coolsonic. What are the differences between Shurink and Coolsonic? I am particularly interested to know about the pain level.