I have no clear preference. I make decision based on models, not brands.
What I have in use:
main rig, internal storage
2000GB WD Caviar Green (5400rpm), 4-platter
2000GB WD Caviar Green (5400rpm), 4-platter
1000GB Samsung F2 Ecogreen (5400rpm), 2-platter
1000GB Samsung F2 Ecogreen (5400rpm), 2-platter
1000GB Samsung F1 Spinpoint (7200rpm), 3-platter
retrofitted to Topfield PVR as HDD upgrade
1000GB Samsung F1 Spinpoint (7200rpm), 3-platter
Old P4 (Prescott) -based computer
120GB Samsung's 5400rpm, 1-platter, laptop HDD (yes, in a desktop case)
Old Duron-based computer
80GB Maxtor DiamondMax +9 (7200rpm), 1-platter
Old P3-based computer
80GB Samsung P80 (7200rpm), 1-platter
Ancient 486/66MHz Compac Presario 520CDS
421
MB Quantum ProDrive LPS 420 AT (3600rpm)
There's also some laptop drives used in laptop and 2.5" SATA enclosures
320GB WD Scorpio (5400rpm), 2-platter
320GB WD Scorpio (5400rpm), 2-platter
80GB Toshiba (5400rpm), 1-platter
What I have retired as functional / still using for offline back-up:
in external SATA enclosures
1000GB WD Greenpower (5400rpm), 3-platter (same as Caviar Green, it's name was changed)
1000GB WD Greenpower (5400rpm), 4-platter
in external PATA enclosures
400GB Hitachi Deskstar 7K400 (7200rpm), 5-platter
320GB WD Caviar ("7200rpm"), 3-platter
250GB Hitachi Deskstar 7K250 (7200rpm), 3-platter
250GB Maxtor MaXLine +II (7200rpm), 3-platter
in 2.5" PATA enclosure
12GB IBM Travelstar 12GN (4200rpm), ball-bearings, noisy as hell
lying on the shelf
300GB Maxtor DiamondMax 16 (5400rpm), 4-platter, ball-bearings, whines, half-dead, bad sectors
250GB Seagate Barracuda DB35.3 (7200rpm)
40GB Samsung PL40 (7200rpm), 1-platter, half-dead, bad sectors, SMART warning condition
20GB Seagate U5 (5400rpm), slow as a snail, makes occasional odd screeching noises, ball-bearings but surprizingly quiet for a bb-drive
Then there's some 10GB, 4.3GB Maxtor 5400rpm drives, one Quantum Fireball ST 3.2GB, two Bigfoots (CD-drive sized HDDs!) (BF-series 2.5GB and CY-series 4.3GB), Seagate ST3660A Medalist 545XE (544MB, 3811rpm)... all of which naturally have ball-bearings as they're old. In perfectly functional order (a few bad sectors at most).
The oldest drive I have is a Miniscribe M8051A P4, 41MB, 3484rpm. That's quite a historical model. It was the first drive to have IDE/ATA/PATA (whatever you like to call it) interface. It was also quite a bit ahead of it's time, using voice-actuator coil instead of stepper motor... which from perspective todays perspective is rather shame because voice-actuators are boring... but leaving nostalgic feelings aside, they're just simply so much better that steppers had no chance to prevail.
You cannot get anything older than a Miniscribe M8051A and expect it to work on a modern computer because all older HDDs require RLL or MFM controller... neither of which are NOT available as PCI addon cards (back in the old days, we had ISA bus, and other odd stuff). It's stamped at the factory to have been manufactured JUN 1989 so it'll have it's 21st birthday soon.
Who, sidetracked...
HDDs that I've had to die on me:
200GB WD Caviar (WD2000JB), "7200rpm", 3-platter
300GB Maxtor MaXLine II or DiamondMax 16 (5400rpm), 4-platter (Yes, I have a half-dead one. That was a replacement I got for returning this drive.)
1000GB WD Greenpower (5400rpm), 4-platter
Note: where I've stated "7200rpm" with quatation marks, I'm quoting official specs. It has been know that WD's 7200rpm have sometimes been ~6900rpm in reality. Likewise Caviar Green (=Greenpower) are "5400-7200rpm" but in reality they are all 5400rpm. No variable rpm. (Only Hitachi has variable rpm and it's implementation is hardly as beneficial as you might expect. HDD cannot be accessed in low-rpm mode.)
Not a statistically significant sample size to draw any actual conclusions on reliability. I've had least trouble with Hitachis but they manufacture only 7200rpm drives (=noisy) so I prefer WD and Samsung nowadays (and obviously only their 5400rpm models (Ecogreen, Caviar Green (Greenpower)) and not their 7200rpm models (Spinpoint, Caviar Blue, Caviar Black). Seagates have been bad lately with firmware corruption (=bricking) issues. Issues are probably over already but nevertheless a proof Seagate is not superior to competition. Also their low-rpm drives are 5900rpm and not 5400rpm. They're also noisier.
End TL;DR rant.
Suggestion: refer to
www.silentpcreview. com for information of HDDs. After all, noise aspect is probably the most important, and SPCR is the only worthy noise-fixated computer review site.