The Fuma is the better of the coolers, runs extremely quiet almost Noctua quiet and rightt at the NH-D15s levels. The Cryorig has a superior mounting system, again comparable to Noctua, the mugen 5 being almost identical to the H5 in performance, is shorter on the heatpipes, so can have ram issues with really tall heatsinks.
Most of the issues with the Scythe coolers is supply, as soon as they come in stock, they are gone, an issue with early cryorig releases, so while the H5 is slightly behind the Fuma, it's probably far easier to get ahold of.