Choice between CNC 3040

[CarecaIII]

Hello. I would like to buy a CNC 3040 and I'm facing two types of 3040.
This:

https://www.ebay.co.uk/itm/Ballscrew...MAAOSw4DJYkZxE



and this:

https://www.aliexpress.com/store/pro...6eec34cbjnwFaW



What do you recommend me? Thank you

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