I've used IBM, Quantum, Seagates, and Western Digitals. From my experience, I like the IBM the best.
It's the quietest, very reliable and very fast. My Quantum is good and fast too, but it's very loud in comparison to my IBM drive.
I'll admit though, that not all of the above drives are in the same category type, so my judgement is based upon "comparing apples to oranges".
You can't go wrong with an IBM drive though, most of the parts that they manufacture are used in other hd makers products.