I use Phototex. I wish it had a little sheen to it. Contour cuts as stated above with a strand or two in sharp corners. Easily cut off with a blade.
I tried a sample of Seramark. Printed well, looked great. I applied it to stained & varnished coffee table leg. When I pulled it off 2 days later it left a sticky adhesive film behind. Used Goof Off plastic to get it off. Not good. Not sure if it would do that to a painted sheet rock wall but if it did getting the adhesive off would be a nightmare. Just one man's experience, your results may differ. Back to Phototex. Too bad cause Seramark is a nice looking product.