The Gracies..man what a family of Champions.. I fought thai and international rules back in the day. although it's more punishing physically,i preferred the Thai rules. Simply because that was the style I trained in. Both have good merits though. National all styles was more traditional, Karate V Kung Fu, tae kwon do, judo,jui jitsu etc. Kept us on our toes defending against multiple attack styles. The day i won the state championship I had 4 bouts of 3x 5minutes rounds against 4 styles....boy was I glad when that was over ...AND SORE!