The IronWolf runs at higher RPMs compared to the WD RED, so its no surprise that the IronWolf is also louder on average than the WD RED drives. Seagate IronWolf vs. WD RED... · Reliability · Why you should not buy the...
Between the two, there's really not much difference. Both are CMR, both have the same warranty period, both have the same MTBF and the same/similar features.
They're really similar. The IronWolf drives have a little bonus feature on Synology NAS that they give extra health info, but it's unclear if this is really a ...