Don’t hold me to this but the dac engine for both is what Lampizator calls engine 53. The question that I would ask myself is which tube types do I prefer. Do I like the sound of DHT (300,px25,242,45,etc) or Pentode (el34,kt66,kt77,etc). The other thing to keep in mind would be cost associated with the tubes. The Pentode tubes are cheaper to obtain.
I have not heard the trp but do own big7 that has been upgraded to the golden gate and love the sound.