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I think the preference difference might have something to do with being used to scroll wheels or not. I personally grew up using mice with scroll wheels before I got my first touch screen device (iPod touch) so when trackpads started supporting multi-touch scroll I was already used to scrolling my fingers down to move down in the content.
I don’t think that’s it, since I also grew up with normal computer mice - my first phone-type touch screen device was probably around 12/13, at which point I already had lots of desktop usage.