According to some recent research, if the dose of the oil, ie the EPA and DHA amounts are the same then there is no difference in the effect on the blood levels of the oils achieved.

( you will need to look at the smallprint on the labels)

If you have inflammation or autoimmune issues then 2000mg EPA per day is the desired amount.

http://www.ncbi.nlm.nih.gov/pubmed/26328782