Either are "right". Generally engineers prefer to use tightened bolts on bracing to minimize slip and reduce any secondary deflections due to the slip in the bolt connections.
I would say the allowable stress (strength) used for design is higher when checking Type N (or Type X) bolts verses Type F bolts. Since it is the same bolt, I don't agree that the bolt is 'stronger.' Also, there is a lot of confusion about when you may use the Type X values, and I have convinced engineers and contractors in the past they don't want to go there. I don't recall the last time I used other than a Type F. Good luck!