Yev from Backblaze here -> we wrote about this in 2013 and have honestly not bought too many enterprise drives since, simply because they were more expensive and the benefit was negligible in our usage. Lately though Seagate has had a nice run of enterprise drives and they're well-priced, so we might be giving those more of a shot in the coming months!
I believe when you're buying as much drives as they do and produce the kind of reports they do they measure and compare before reaching that conclusion.
I think having the drives spin constantly is the best for lifespan, because there are less spinups and thus components wear less.
So barring any manufacturing defects that I'm soure would be abundantly clear early on, it's down to logic or electrical failures.
A few years ago, the consensus (and data) was that they were mostly the same thing and it was arguable to pay double for the enterprise one.
But... in recent years, the consumer market have moved toward ever cheaper, slower and power savings hard drives (e.g. reduced RPM and stop the disk when unused for 30s).
That calls for a re evaluation of the situation.