The iPad is expensive, but it has a Photoshop app() that I could try even to friends and of which I am very excited. Now my question: What operating systems are now all a Photoshop version? Andriod is clear, but what else?
The iPad apps are not Photoshop. They are applications that work WITH Photoshop (running on your desktop).
None of the current tablets have enough RAM, CPU, or GPU power to run anything close to Photoshop.