I've had both WD 3.5" drives that I've owned fail. Both were 7200 rpm; one after 3 years, the other after 11 months. WD would not honor their 1 year warranty on the second one. I'll never buy another WD drive again.
I have one 2.5" WD drive that is now in an external enclosure (I replace my MBP's internal with a Samsung). It's less than a year old and seems to be fine.
I've had 3 Seagate 3.5" drives and all three have performed flawlessly. One is retired, the other two are still humming along.
I've owned two Samsung 2.5" drives; one for my MBP (320 gig) and one for my Apple TV replacement. Both have worked without issues.
I have one IBM DeskStar 3.5" (now owned by Hitachi) and it worked fine, too. It also is retired.