What are some alternatives?
When comparing A-Painter and VR Sketch, you can also consider the following products
Tilt Brush by Google - Paint in spaces around you with Virtual Reality
SprayPrinter - Convert digital designs into wall art from your smartphone
MasterpieceVR - Powerful VR sculpting & painting tool
Oculus Medium - Sculpt, model and paint in virtual reality on a 3D canvas.
Poly by Google - Explore the world of 3D
AI Painter - Turn your photos into paintings