Which HDD is best for OS?

xWinterSolstice

Distinguished
Jul 1, 2014
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I currently have a Western Digital 1 TB HDD (Blue) installed in my PC right now, but it's nearly full. I'm buying another Western Digital 1 TB HDD, but this one is the black performance edition. Should I transfer my OS over to the Black performance edition or just leave it on the standard Blue? Furthermore, for the most efficient use of both, what should I store/use with each?

CPU: AMD FX 8350 Octacore
GPU: NVidia Geforce GTX 760
RAM: Corsair Vengeance 8 Gb DDR3
HDD: Western Digital Blue 1 TB Internal 7200 RPM
Operating System: Windows 7 Home Premium SP1