Haye-Klit is more important for the division and perhaps for the sport, but JMM-Pac will provide a spectacle and carries a legacy that showcases a lot of what the sport is all about; heart, technique, and physical ability. At least I'd rather watch that than Haye-Klit simply because of the fighters involved.
In the US, Pac is more relevant, but in Europe almost noone gives two shits about him. Globally, it's Haye-Klit
haye is probably the last hope there is for a new HW champion. So I'd never want to miss that. As for pac-jmm 3, great fight but pac takes this one rather easily, jmm is old and didn't look all that good. His skills carried him through but they were all tailor made for him(diaz, katsidis)