Yes there is! Because in the MBP 13" at 2160p I could keep 2x scaling, which is much better than this 1.3x/1.5x fractional scaling I have to keep in the Dell XPS 13".
Assuming you have good eyes, twice the DPI means you can have your text almost-but-not-quite twice as small without losing readability. Which is effectively the same as giving you almost-but-not-quite twice the screen real-estate.