I have owned and currently still own several products from both Marantz and Emotiva for the past ten years (PM6004, CD5004, Stealth DC-1, Mini-x-a-100). I have heard many of the Marantz receivers at friends house. You're essentially trading the house warm sound of the Marantz for a tiny more resolution, more neutral in the mids, although with the risk of getting a brighter, fatiguing sound. I will say that the Emotiva is better at maintaining linearity at different levels.
What are you planning on using these with? For a more balanced sound, the NAD integrated are more neutral. It comes down to component matching and personal preferences.