i got flax seed oil (omega 3, 6, 9).
part of the reason was that i wasn't sure whether the fish oil was okay with respect to heavy metal accumulation in the fish...
the other part of the reason was concern about the fish oil making my breath / pores smell (controversial whether it does or it doesn't)
another part of the reason is that i'm not at all sure that the fish oil is harvested in a sustainable fashion and i'm concerned about nets capturing dolphins (for example) and just generally speaking i think we are better not to harm living things (who might feel pain given that they have a nervous system) over flax, for example (that lacks a nervous system).

same active ingredients...

have trouble remembering to take the darned things truth be told...