NCNCA's Toughest,/Most demanding race

Ok this is inspired by a discussion a few of us were having the other day. I thought I'd let others in on the fun. What do you think is the toughest, hardest, most demanding race in the NCNCA territory? Factors you might want to consider, and use to justify your pick are

selectivity of the course

History of quality fields

overall skill set needed to win/finish

any other factors you think that should be included

Have at it folks let the debate begin. :D

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