Never thought of the Xbox that's a good idea , yeah I've got a Samsung 4k tvFirst question should be is, do you have 4K HDR compatible TV? If so, go with the Xbox One X over the Pro as the X should always beat the Pro in multiplats as it is by far the more powerful console.
If 1080p TV - wouldn't bother with the upgrade to either the Pro or the X unless loading times mean anything to you.
Shawrey