I would check the compatibility list for Xbone Backward Compatibility. If some of the games you want to play are on that list, you might be better served to get an Xbone or an XboneX.
Xbones don’t give resolution upgrades to BC titles like the X does, but the framerates are usually improved. XboneX of course gives a resolution boost as well. In addition to forcing increased texture filtering and AA. I don’t think the Xbone does that, either.

