as far as the brand, ill simply say neither is better than the other, unless you have brand loyalty. for instance, im more partial to WD myself, raptors in particular... going beyond brand though, just purchase a hdd thats within your budget and offers decent performance... for instance, a seagate 320GB 7200.10 sata pmr hdd, is under $100... its currently one of the best 'price/perferformance/capacity bang for the buck hdds', fitting your criteria as well
as far as reliability is concerned, the warranty should be taken into consideration too, if a hdd fails within the warranty period, you can just rma it, and receive a replacement