S.T.
I prefer ground flaxseed, partly because it's vegetarian, and partly because it's so easy to use. I can put it in baked goods, on cereal, in a smoothie, and my child never knows it is there. She always knew when I put fish oil in something, and I thought it tasted pretty good (it was raspberry flavored).
On a "save the planet" tangent, the fish oil capsules result from some severe overfishing that is removing fish from the food chain, and the overfishing could lead to long-term problems. I'm not a hippy-dippy type (well, other than being mostly vegan and that is for my own health, not for the animals' welfare), but that alarms me. http://www.time.com/time/magazine/article/0,9171,###-###-...