I'm using a teaching video (the instructor expects people to follow his instruction) to paint a scene in oils. He is using a stretched canvas 15x30. I don't have one. I planned to use an 11x14 one. OR, I could use two 9x12 canvas papers taped together. Mine will be a practice piece for a much larger but somewhat similar basic scene, where I will be able to use his instructions I think. Which would you choose, the 11x14 canvas, or the canvas paper for this practice piece?