I used to take fish oil. I switched to krill oil because the pretty packaging told me it was better and it is a smaller pill. Now, I am reconsidering because of an info-program on an AM radio station. It seems that both have benefits. Check the EPA and DHA levels in your supplement. There are also antioxidant action to be considered.
It seems that there is still a lot of research to be done to find out which, if either, is better for what. As I have stated in the previous popping pills posts, please consult your doctor before adding any supplement to your routine. Fish oils can affect you in unintended ways and may not be suitable to for use with certain medications. Fishy burps are supposed to be helped by special coatings used by some brands and by freezing the pills. I have not had the problem with krill oil.
I started taking an Omega 3 supplement because my dry eyes and aching joints. Purported cardiovascular benefits were just a bonus. I do try to eat fish and seeds that contain omega 3’s, so I do not take supplements everyday. My food list: flaxseeds, chia seeds, salmon, sardines, walnuts, white fish (please be careful with mercury levels in fish). For a long list of foods and their fatty acid content click here. Currently, there is no RDA for omega 3.