I have a cintiq companion 2 (predecessor to mobile studio) that I take when I need to do art on the go. Granted it's pixel art, but it works with photoshop fine and clip studio paint better. I sync it to revision control so it's basically a portable desktop.
Come to think of it, the mobilestudio has been out for almost 2 years and just had a big price drop... wonder of they will come out with improved ones, soon.