Cant speak directly about either one but I did own and use the NAD PP1 way back when. It was fine.
Nothing spectacular but it didnt appear to have major flaws. It did its job and worked well.
I honestly forgot it was even in the circuit. Just throwing this out as another option. I'm sure google
will have plenty of info. Again, I'm sorry I dont have direct experience with either one....hopefully
someone will chime in soon.