It is hard to answer partly because it has been awhile and they were close in many ways. The Veritas is a great amp and the designer a great person who is passionate about music, and meticulous in his design. Consequently, Veritas is very clean, ultra quiet and dynamic and would be a revelation to many who have dismissed Class D.
Amps are system and room dependent. That said for me the Nuforce which uses a proprietary analogue way of doing Class D sounds better to me on many dimensions - I think they are more liquid and natural sounding and I use live music as my reference, and for me they sound better on transients, decays, micro detail and macro dynamics and are also ultra clean and quiet. And with the Ref 20 they are better on sound stage (bloom, depth and width). I have not heard any Pascal S-PRO2 modules based amps.