Everything fails. Eventually. The difference between Quality and Junk is not the occurances of failure, but the amount of use before failure.
But that only applies to working stock that's working as intended. Electronics in general are governed under Murphy's Law. If it can fail, it will fail, it's only a question of when.
Which means you can do all the research, purchase the absolute best and most reliable HDD on the planet, and it dies completely in a week of use.
Figure most HDD's are going to be roughly reliable for about 5 years of general usage, so I'd get the Exo if that fits your needs for reliability and size and performance, and revisit purchases in 5 years±.
I've had a WD Black last over 7 years, a WD Blue was still...