I have been in the game a long time... And they are both good companies.
Personally I own the 1TB seagate 7200.11
Its a great drive, fast and quiet. When i first received it I had to RMA it. Would disappear from disk management, wouldn't format correctly.
The Re-Certified drive that they sent me failed a week later. Could not write any data to the drive.
the Third drive they sent (another Re-certified) has been running fine for 3+ Months, and i think it will run for a very long time.
On the other hand I have a 750Gig 7200.10 in the same machine that has been running for 2 Years no Problems at all.
And a WD 74GB Raptor That has been running for 3 years on top of that.
Just dont get a Maxtor