Really it probably makes more sense to think of the X Pro as the MateBook 14: it’s a slightly larger model of essentially the same device, which uses the extra space to cram in another port, a bigger battery, and optional extra RAM. If those matter a lot to you then pay the extra, but if not you’ll probably find the MateBook 13 or X more than sufficient. As for choosing between the MateBook 13 and the original MateBook X, it really comes down to whether you prioritise performance or portability. The 13 will definitely pack more oomph - but the original X is notably thinner and lighter.