I use Photoshop, but I am cheap: I don't pay Adobe, but use CS2 which was a free download because it is not updated anymore. I am on Windos and yes, it crashes from time to time. It slows down considerably, like an old man running out of air, so I have to frequently reboot.
Flash will be history on all OS very soon. Never tried Linux - my friend Leo Plaw is trying to talk me into it, but I am an old dog - hard to learn new tricks.