fanless PSU's are generally crap. (while they are built quality, they not only require more case airflow), but they also require more positive air pressure)
When you go with a fanless PSU, you are essentially taking the 120MM fan from the PSU and moving it to one of the panels on the case where it is closer to the outside of th case and thus louder.
(with a quality PSU, you can get overall less noise by having it have it's own fan, and then having just 1 other fan in the case, then having to put 2 or more fans in the case to maintain the air pressure needed. (also when the PSU is placed inside of a case and the side panel closed, the PSU's fan noise is mostly contained, and thus it generates less noise outside of the case than having that same fan mounted on the front or side of the case).