The easystore line is a BestBuy only hard drive with missing features (you cannot set a password or encrypt the drive) and a reduced warranty when compared to the WD MyPassport line. Otherwise it's a WD manufactured hard drive that offers great transfer speeds. Because the easystore has fewer features, it is generally cheaper. In this case, because the MyPassport drive is cheaper, I'd recommend that drive over the easystore.
Check this thread