I have both a XP-Pen Artist 15.6 Pro Pen display Drawing Tablet and the current generation of the 12.9 iPad Pro and Apple Pencil. I got the Artist 15.6 Pro first and used it constantly before I got the iPad. Then I got the iPad and the Artist 15.6 Pro mostly goes unused these days unless I need to specifically use Photoshop or Illustrator.
The Apple Pencil is decidedly a better drawing experience than the P05R Pen on the Artist 15.6 Pro . It's more accurate, has absolutely no parallax, requires no calibration, it has a more intuitive pressure response curve, and the feel of the stylus point on the screen is better (this one point is more subjective, but is how I feel about it).
On top of that, the iPad's touch gestures are second to none. Pinch zoom an