I haven't kept an eye on the evolution of WD's lineup, so I don't know why Purple is better than Ultrastar. To be honest, I have no personal use case for either of these product types, or even the disposable moolah to afford them, so I cannot speak the Word of God(tm) either way.
The only thing that juts out at a glance is that Ultrastar potentially has a much longer lifespan and data transfer volume (the yearly amount of data read and written to and from the HDD itself), and the warranty is five years instead of Purple's three.
Also, US is designed for DataCenters, whereas Purple is aimed towards the 24/7 storage of security video footage (CCTV, DVR).
No clue about the (actual, not advertised) failure rate of either product line.
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