Based on my personal experience, WD drives have been more reliable than Seagate ones, but then I have bought a lot of hard drives in my 30 years of computing. That's not to say WD drives never fail, they all fail eventually. And even WD produces a bad batch from time to time which fail within weeks.
But I've definitely had fewer bad drives from WD than from Seagate, that's a fact.
My first WD drive failed after 6 years (which was about a week ago). I have 2 Maxter drives (one external one internal) and they both still work. I recently obtained a few Seagates from 05' but they have so many ECC errors coming up from using SpinRite i wouldn't trust them with important information. I still trust WD over Seagate but it's up to you.
WHICH IS BEST BETWEEN 1TB SEAGATE AND 1TB WD.......?????
Hard drive technology is 30 years old and these products have essentially become a commodity...There are people that will argue for either saying that one will have a higher failure rate than the other...but most likely they have the same failure rate...