The iPad only runs tablet apps, the Surface runs anything that works on Windows 10.

I came real close to ditching my Mac + Wacom combo for a Surface + external keyboard for my art work a couple years ago, but there was a constant lag problem somewhere between my stylus motions and Illustrator that made it unusable, even after a month of regular attempts to find the one magic setting somewhere deep in the ten different control panels related to Windows' stylus drivers.