I'm not sure what the difference is between 3 6 and 9. But I seem to feel better when I am taking all 3. But as far as I know, they are all found in fish oils and flax oils. They are essential fatty acids that our bodies can't reproduce which is why we need to take them as supplements. Or eat a lot of fish/flax!
I'll see if I can do some research when I get home, and I'll try to give you a better answer tommorow.
