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Quoted read/write speeds for the pro is much higher than the non-X.

The Pro X uses 3D MLC nand while the non-Pro probably uses 3d TLC nand.

Is there any downsides on using Pro X, except it works only with 10.13.4 + ?
 
I'd get the pro but, before buying, I would look into getting an Apple OEM drive from eBay. For example: https://www.ebay.com/itm/MacBook-AIR-Pro-Retina-A1398-A1502-A1466-Late-2013-2014-2015-512GB-SSD-30dayWTY/223058334533?epid=1128451617&hash=item33ef501345:g:at4AAOSw5M1bRBUG&_sop=15&_nkw=macbook+2014+512+ssd&_sacat=0&_from=R40&LH_BIN=1&rt=nc&LH_TitleDesc=0

I'm not sure where you are located and some sellers restrict shipping to certain locations.

Is there any issues with Aura drives? I am from Kazakhstan, most of the sellers refuses to ship.
 
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