FWIW, I work in IT and have done so for a long time.
Don’t ever expect a drive to last longer than the warranty. Plan for it to fail earlier. On mission critical equipment, it is a bad idea to ever leave a drive running (in service) when out of warranty.
It is a good idea to keep at least 3 regular backups of all data, with each backup set going to a different drive. Every night data should go to at least 1 redundant drive. It is a very good idea to also send it to another drive, intended for off site storage.
I'm not a fan of mirror sets as all they really do is to double the maintenance cost. In other words, when one drive of a mirror set fails, you are obligated to replace both drives. Also mirror sets don’t typically help in the case of inadvertent deletion. Worst of all, mirror sets still have a common failure point in the host adapter or anything else in the computer.
Best way to extend the service life of a drive is to keep the drive cool and keep it in as vibration free an environment as possible. you can cool a drive by putting a fan nearby or putting it into a cool room. My server rooms are all kept about 55 degrees (f) and doing this typically adds up to a year or 2 to the service life. Vibration dampening comes in a large part by the chassis in which the drive is mounted.
No drive manufacturer does any better a job at longevity than the others. Use the warranty as your guide.
In an average year I’ll replace about 20 to 30 drives, ranging in age from a few weeks to 3 years old.
Another suggestion is to let a new drive run for a couple of weeks before trusting it as a primary source for your data.
As the most recent example, I bought 2 2-TB WD drives. These were used half time and one failed 1 year and 1 month after it was placed in service, and the other failed 1 year and 2 months after it was placed in service. It is disgusting but that is why the manufacturer provides the warranty they do.
BTW, AMEX will double the manufacturer’s warranty, if you have the right AMEX card...