Fish oil provides mainly two non-essential EPA and DHA fatty acids. These two fatty acids are important but can be produced by the body itself and belong to the ten fatty acids in the omega-3 family. Neither the essential omega-3 alpha linoleic fatty acids, nor the other omega-6 are made from EPA and DHA. Vegetable sourced omega-3/6/9 with alpha-linolenic acid and linoleic acid provides the body with all the fatty acids it needs. That is better. It is holistic. So, If you have to choose for a fish oil, you are still strongly advised to consume enough vegetable omega-3/6/9.

Fish oil does not contain linoleic acid (omega-6) and does not contain alpha-linolenic acid (omega-3), the two essential fatty acids that the body cannot produce itself.