User blog comment:Plexioth- xD/Monster Hunter 3 Ultimate/@comment-5043481-20130116191910/@comment-76.25.119.47-20130116230938

Both hunting horn and DS are infinitely more fun and useful than Unite. The HR system works like Unite until HR 7 after you beat your Guran Miraos urgent where it goes to Tri's HR system, and certain quests (like the rare species) are unlocked at certain HRs after that. All the hunting you do, regardless whether its from Moga or Tanjia, give points toward HR (though Moga quests give fewer points than the same ones in Tanjia), so it's not uncommon to gain 40+ HR after breaking 7.