Seagate IronWolf 6GB vs IronWolf 4GB vs WD Black 4Gb

Itachi_1

Honorable
Dec 4, 2015
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So I'm running this GTX 1080, Ryzen 1600 build and I'm looking for expanding my storage size. This one would be probably added into a NAS to share between two PCs.
As you can see, one of them is 2GB more, which I don't really think we'd fully use, but all of these are the same price (for me), so why not add the extra space, right?
Anyway, I wanted to ask you for your thoughts, experiences, anything that could help me decide.
Any help is much appreciated