Both are equally good. Must have at least 7200rpm. I would go with the one that has the best price. I bought a Western Digital 7200 rpm 200GB hard drive from best buy a few months ago for $205 after rebated. The best price that i've seen out there is $1 per gig. If you want to go to 10,000 rpm or 15,000 rpm then the size shrinks and the price rockets up.