The tul are the original hyung (chong gi, dan gun, do san, won yo, yul gook, etc) created for itf tkd. The palgwe, I believe, were created for the wtf before the taeguek poomsae. Not too sure about the history of palgwe except that in the 80's they were removed from the required curriculum for advancement in kukkiwon tkd.Many old school gm's kept teaching them and passed the tradition on which is why you may still see them at tourneys. They are not allowed in competition at official usat/wtf sanctioned events(state championship, national qualifiers, nationals and international events).