I've flown both of these models in the 8m size and I felt they were very comparable kites in how they performed. I'm about 65kg and ride both twin and directional boards. Personally I think you'd be happy with either kite. I did feel that the Evo was a little more stable during gusts, but I think it's due to the battens on the wing tips. Jumping on the Evo was also AWESOME for hangtime! The attention to detail and the overall construction is more sophisticated on the North kites imo. I also like North's control bar better than Best.
Whichever one you get though, I think you'll be stoked!