Those who prefer fish oil seem to focus on the cardiovascular benefits of larger doses EPA and DHA and aren't concerned about ALA, while those who prefer flaxseed oil are more focused on ALA and the body's other uses for ALA than just making EPA and DHA ,and feel that those without cardiovascular issues may be better served by taking flaxseed oil. The next question is if you do take both(as some websites recommend) should they be taken together or as far apart as possible?