There's a a lot of talk about which is better, Judo or Brazilian Jiu Jitsu, Sambo or Catch Wrestling, etc. Grappling is grappling in my book. The different grappling arts have their unique sports and rules sets. But if you grapple, you will become better at grappling. Grappling without a Gi is submission wrestling, which is kind of free style in that you adopt techniques from the major grappling systems into one. Here's a clip of Demian Maia (BJJ world Champ) and world class Judoka, Tiago Camillo working out together.