Leupold Mark 5HD 5x25 or Nightforce NX8 4-32?

[CWM-RHG]

I'm building a 6 Dasher competition rifle for a client and he is on the fence on which one of these scopes he should put on his rifle. We've had a couple of top ranked PRS guys tell us that the NF isnt clear around the edges at longer distance. Just looking for input here. Thanks