I've been told recently that the best program for digital art is Paint Tool SAI, and that I should learn to use that, not Photoshop, GIMP or any other program. Whether this is true or not, I'm not sure, I'd actually love to here what programs people use the most, and why. But until I get convinced otherwise, I'd like to get to use this program. So any tutorials would be very helpful, send me links in the comments, or PM me!

P.S. If anyone knows this, I'd like to know, how do I reset the program to it's factory settings. For example, if I'm experimenting with an effect, or a setting, and I can't get back, I want to be able to put everything back the way it was, before I started messing around.