What are some alternatives?
When comparing Kingspray Graffiti and Oculus Medium, you can also consider the following products
Quill by Story Studio - Paint in virtual reality on an infinitely scalable canvas
MasterpieceVR - Powerful VR sculpting & painting tool
A-Painter - Paint in VR in your Browser
Tilt Brush by Google - Paint in spaces around you with Virtual Reality
VR Sketch - A tool for designers to draw inside virtual reality
Blocks - Empowering designers to build great websites without writing a line of code. For web and OS X.