Should we tack on an "XP" for good measure?

Xbox Series with X > S (so if you want the high end of the current generation you want the Xbox Series X; if you want mid-range things are more complicated because you can now get an Xbox One X, but not the Xbox One, used for much less than you'd get an Xbox Series S for and which one is "better" is a dice roll depending on the games you want to play and if 4K matters to you…)

Series is a real weird word to use there. But it also doesn't help that the versions are extra complicated because with "PC-like compatibility" in everything after the Xbox One playing just about the entire same library you need a bit of a matrix to figure out which is best for you if you don't care about the "latest and greatest".