What are some alternatives?
When comparing MasterpieceVR and Oculus Medium, you can also consider the following products
Tilt Brush by Google - Paint in spaces around you with Virtual Reality
VR Sketch - A tool for designers to draw inside virtual reality
A-Painter - Paint in VR in your Browser
Snap Art - Snap's augmented reality platform
SprayPrinter - Convert digital designs into wall art from your smartphone
Quill by Story Studio - Paint in virtual reality on an infinitely scalable canvas