Papua New Guinea - which festival to go to?

I have the opportunity to go to PNG next year
I could go to the Mt Hagen Festival or the Goroka Show
Which would be better?
I am interested in photography and videography and would like to see the most varied tribes as possible
thanks

hi,
it's been a while since i was in png, but i lived there for a couple of years (97-99) as a peace corps volunteer. i'd say the goroka show. we spent 3 mos. living w/a host family during our initial training period. happy to try to answer any more png questions. we still hope to get back some day & visit some of the best people we've ever met!