The X actually has less screen real estate out of the two. This myth continues for some because of the larger diagonal size on the X to the Plus phones (5.8" vs. 5.5"). The diagonal measurements don't actually account for how much information is actually displayed on the screen due to the wider screen width of the Plus phones.
The X is actually a good deal smaller than a Plus in displayed screen info, which has the same relevant horizontal "points" as the standard 6/6S/7/8...NOT the 6S+ (though the X has more vertical points than the standard 6-8 obviously cause of the lack of bezels):
"Apps, websites, and so on have 414 horizontal “points” — the unit of measurement that the screen is divided into for design purposes — to fill on the Plus, while the X has 375, the same as the regular iPhone 8".
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