basically, i listened to a seminar from Dr. Michael Murray on this issue. Women are really good with flax according to him, they can convert it well in their body to DHA and EPA, but men cannot. Due to hormones and whatever else he said (i forgot), the male body cannt use flax as well as women can. Since the Fish oil already has EPA and DHA in there, men dont have to worry about converting it in their bodies.

So, for you women out there, stick with the Flax.
But for you men, it would be more beneficial to go with Fish Oil... and when you choose fish oil, make sure its Salmon or another cold water fish, they are purer.