Any reason why? It's $8 left and the HDD I picked is a Hybrid drive.
I just looked at the specs and it turns out both are great choices. the speed of the hybrid is faster than the black (not by a great deal but still respectable), but it has a higher fail rate. the wd, on the other hand, has longer warranty by 2 years, much lower fail rate, and just a better known brand
so really its speed vs longetivity