An unanswerable question. Both speakers work fine with the NAD. It is your speaker preference that matters far more than your amp preference. Just get a speaker model from PSB or Paradigm that performs well within the power envelope of the NAD model you bought.
In other words, if you have a 50 watt NAD, don't buy a speaker that needs at least 100 watts to really sing.
thanksyou, also the mission m74i and the m72i are these two pairs a good combo with the NAD. is this brand compairable to the psb and the paradigm. also you mentioned that the speakers required watts should be the same as the amp. could u elaborate a little more on this. thanks