I found myself in same quandary last month. Finally got fed up trying to decide and chose WD (bought three 1TB drives) as I had an old one still going strong that had outlasted a seagate, haven't had a problem with new drives so far, not noisy or anything.

My decision did not have any logic to it as todays drives are made in different factories and countries than my old drives were.

One point to check up on, is if WD drives will fit into those Docking Stations, I seem to remember that there are some that don't because of the placement of the pins on back of hard drive.

I've owned both brands in the past and find no difference between them.