From my experience, 500 GB from WD black edition are really long lasting drive (had one for more than 8 years now)
I've seen a little bit failure rate with 750 gb (WD and Seagate)
While 1 to 2 tb are even worse with any brands.
Right now im staying away from 3 -4 tb, because their are complains about data corruption and such.
I really hope they get Hd more reliable, because it's getting worse and worse .