EPA and DHA are both important! Keep in mind most fish contain almost equall amounts of EPA/DHA. DHA is a major structural component of our cell membranes. EPA is transformed into localized hormones which also have very important functions. If you chose a Salmon Oil supplement make sure it says "Wild" on the front label otherwise it will be farmed! Even Norwegian Salmon Oil is farmed! Most other fish oil supplements are from wild anchovie, sardine and mackeral oil. Peru is the worlds leading producer and exporter of anchovie and sardine oil.
I have audited over a dozen faciltites and would reccomend Natural Factors, Nordic Naturals and Carslon fish oil supplements. For Wild Alaskan Salmon Oil I would reccomend Natural Factors. Great price, much less expensived than New Chapter or other brands. Carlson Norwegian Salmon Oil is farmed, not wild.