HDD Black
Go with the 750 GB drive, if you really can't buy hard drives at better prices from online stores. I don't know where you are located (country), that you find paying 60 euro for a 750 GB drive is reasonable.
Why... those 200 GB drives would be fairly old... probably 6-8 years old.
While WD Blacks are fairly well made and normally have 3-5 years warranty but those 200 GB hard drives were most likely used in datacenters where they ran for years 24/7 doing their thing. The power on hours would be huge for those.
Even as high quality as they are, once they go over around 4-5 years of continuous operation, the chances of them failing goes up by a huge amount.
I think WD still made 750 GB WD Blacks up until around 3-4 years ago so if you're lucky, those 750 GB drives could even be new old stock (hard drives that sat on shelves as spares for servers or waiting to be sold or something like that) but most likely they were pulled from servers after only 1-2 years of continuous operation (because hard drives became cheaper and also because SSD drives appeared)
So the point is those 750 GB drives would still have some life in them, and there would be less risk of them dying on you.
The 200 GB drives would also most likely be SATA 1 or SATA 2 while that 750 GB one is probably SATA 3 ( up to 600 MB/s) which actually doesn't really make a difference, what matters more is that the newer drive will support features like NCQ (which would improve read and write speeds) and the 750GB drive should also have bigger caches and because the data density on the platters is higher, the transfer speeds to and from drive will also be faster.
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