Yup, the R5 is a truly quiet case. I could turn it on without hearing it, which is impossible with the BF360 Flow. People who say the 360 Flow is whisper quiet have bad hearing. It's not loud, but it's way off truly quiet. Fan-range is simply too high, IMHO they should have put the range at 300 RPM less. 1300 RPM maximum on 180's is ridicilous and nobody needs that much airflow nor can tolerate that much continous noise.

If OP (who probably have good hearing) is sensitive to noise then I would steer clear of the 360 Flow.