I was thinking of getting the NZXT because of how amazing it looks but now that I have seen a couple of builds that include the R4,it makes me want to get it too.I have heard the r4 is really quiet so can you basically just list the PROs and CONs of each thanks.
In my honest opinion the NZXT Phantom looks AMAZING and has really good features as well. I would go for that one. As for your comment about the Fractal R4 being really quiet, there really is no difference is noise between the two cases. Each of them have brilliant airflow and watercooling options.